What Crimes Can Revoke U.S. Citizenship? (Legal Facts)

The Legal Standard for Citizenship Revocation

U.S. citizenship—whether acquired at birth or through naturalization—carries exceptional constitutional protection. The government cannot revoke it at will or for ordinary criminal convictions committed after naturalization. Denaturalization, the legal process of stripping naturalized citizenship, requires the federal government to prove either that the citizenship was procured through fraud or illegal means, or that the applicant concealed or willfully misrepresented material facts during the naturalization process. This standard is rooted in statutory law at 8 U.S.C. § 1451(a) and reinforced by decades of Supreme Court precedent holding that citizenship, once granted, cannot be taken away lightly.

The distinction matters: a naturalized citizen who commits a crime after becoming a U.S. citizen faces the same criminal justice consequences as any other citizen—prosecution, conviction, sentencing—but not denaturalization solely because of that crime. What triggers denaturalization proceedings is evidence that the naturalization itself was tainted: that the applicant lied on Form N-400, omitted required disclosures about prior arrests or affiliations, or fraudulently claimed to meet eligibility requirements they did not actually satisfy.

Denaturalization cases are civil proceedings filed by the Department of Justice in federal district court. The government bears the burden of proof, and the standard is clear and convincing evidence—a higher bar than the preponderance standard in most civil cases. Because citizenship carries such fundamental rights—the right to vote, to run for office, to remain in the country permanently without deportation risk—courts scrutinize denaturalization complaints closely. Still, when the government can demonstrate that naturalization was procured through fraud or misrepresentation, it can and does succeed in revoking citizenship.

Crimes That Indicate Fraud in the Naturalization Application

Certain criminal conduct, while not automatically triggering denaturalization, serves as evidence that the applicant lied during the naturalization process. The crime itself is not the basis for revocation—the lie about the crime is. Four categories of crimes most commonly appear in denaturalization complaints:

Crimes involving moral turpitude (CIMT): These include fraud, theft, assault with intent, and certain sex offenses. If an applicant committed a CIMT within five years before filing Form N-400 and failed to disclose the arrest or conviction, that omission can support denaturalization. The statutory good moral character requirement for naturalization demands disclosure of all arrests, even those that did not result in conviction. Concealing a CIMT arrest is a material misrepresentation.

Aggravated felonies under immigration law: This is a statutory category defined at 8 U.S.C. § 1101(a)(43), encompassing offenses like drug trafficking, firearms offenses, sexual abuse of a minor, and fraud exceeding $10,000. An applicant who committed an aggravated felony before naturalization but did not disclose it lied about meeting the good moral character requirement. That lie is grounds for denaturalization.

Controlled substance violations: Any drug offense—possession, distribution, trafficking—must be disclosed on the N-400, even if the charge was dismissed or reduced. Applicants who answer "No" to the arrest history questions while concealing a drug arrest have made a false statement under oath, which itself is a ground for denaturalization under the fraud provision.

Unlawful acts that would have made the applicant removable: If the applicant committed immigration fraud (such as a sham marriage to obtain a green card) or re-entered the U.S. illegally after deportation, and those facts were concealed during naturalization, the government can denaturalize on the basis that the applicant was never eligible for naturalization in the first place because the underlying lawful permanent residence was fraudulent.

The government does not need to prove the applicant was convicted of these crimes. An arrest that was never disclosed, even if it resulted in no charges, can satisfy the materiality test if the arrest would have prompted further USCIS investigation or delayed adjudication. The N-400 instructions are explicit: disclose all arrests, citations, and detentions, regardless of outcome. Failure to do so is the misrepresentation.

What the Government Must Prove

Denaturalization is not automatic. The Department of Justice must file a civil complaint in federal district court naming the naturalized citizen as the defendant. The complaint must allege one of the statutory grounds at 8 U.S.C. § 1451(a):

1. Procurement through concealment of a material fact or willful misrepresentation: The government must prove that the applicant knowingly concealed or misrepresented a fact that, if disclosed, would have affected the naturalization decision. Materiality is judged by whether the fact had a natural tendency to influence the decision, not whether it would have definitively resulted in denial. Courts have held that failure to disclose arrests, false claims to citizenship, participation in prohibited organizations, and misrepresentation of continuous residence all meet the materiality standard.

2. Procurement by illegal means: This covers situations where the applicant was never eligible for naturalization—for example, because the underlying green card was obtained through fraud, or because the applicant had not actually maintained continuous residence in the United States as claimed. If the predicate status was void, the naturalization built on it is void.

The government must prove its case by clear and convincing evidence. This is a demanding standard: the evidence must produce in the mind of the trier of fact a firm belief or conviction that the allegations are true. In practice, this means the government must produce documentary evidence—the N-400 application showing the false answer, immigration records proving the applicant was arrested or deported, witness testimony establishing the fraud. Suspicion or inference is not enough.

If the government meets its burden, the court enters a judgment of denaturalization. The former citizen's certificate of naturalization is canceled, and they revert to the immigration status they held immediately before naturalizing—usually lawful permanent resident, though if the green card itself was fraudulent, they may have no lawful status and face removal proceedings. The judgment can be appealed to the circuit court of appeals.

Here's the Honest Answer

Here's the honest answer: denaturalization is rare, but when the government pursues it, the consequences are catastrophic. You do not just lose citizenship—you lose the constitutional protections that come with it, including the absolute bar on deportation. A denaturalized individual can be placed in removal proceedings immediately, and if the underlying fraud involved criminal conduct, they may face criminal prosecution for immigration fraud under 18 U.S.C. § 1425 (procurement of citizenship contrary to law) or 18 U.S.C. § 1015 (false statements in a naturalization application). Those are federal felonies carrying up to ten years in prison.

The government has no statute of limitations for bringing denaturalization cases. A naturalized citizen who lied on their N-400 in 2006 can be denaturalized in 2026 if the government discovers the fraud. The only practical limitation is the government's resources and investigative capacity. In recent years, USCIS and the Department of Justice have increased scrutiny of naturalization files, cross-referencing them against criminal databases and prior immigration records to identify discrepancies. When a discrepancy is found—an arrest that was not disclosed, a prior removal order that was concealed—the case is referred to the Denaturalization Section of the DOJ Civil Division for review and possible litigation.

This is not a process where good behavior after naturalization cures the original fraud. Courts have consistently held that post-naturalization rehabilitation, community ties, family hardship, and length of time as a citizen are irrelevant to the legal question of whether citizenship was procured through fraud. If the fraud is proven, denaturalization follows, regardless of how long ago it occurred or how integrated the person has become.

Crimes Committed After Naturalization

A crime committed after you naturalize does not, by itself, provide grounds for denaturalization. This is the single most important distinction in this area of law. Once naturalized, a U.S. citizen who commits a crime—even a serious felony—faces criminal prosecution and sentencing under the same laws as any native-born citizen, but they do not face loss of citizenship for that crime.

There is one narrow exception: treason. Under 8 U.S.C. § 1451(a), a naturalized citizen who is convicted of treason or attempting to overthrow the U.S. government by force within five years of naturalizing can have their citizenship revoked on the theory that they must have held disloyal intent at the time they took the Oath of Allegiance. Because the oath requires swearing to support and defend the Constitution, committing treason shortly after naturalizing is treated as evidence that the oath was taken fraudulently. This provision is virtually never used—there have been no treason convictions in the U.S. in decades.

Outside that narrow carve-out, post-naturalization crimes do not trigger denaturalization. A naturalized citizen convicted of murder, drug trafficking, tax evasion, or any other federal or state crime serves their sentence and retains citizenship. This is the constitutional rule: citizenship, once validly obtained, cannot be involuntarily taken away except in the circumstances Congress has specified—fraud in procurement, illegal procurement, or voluntary relinquishment.

The Role of Criminal Convictions as Evidence

Although post-naturalization crimes do not themselves support denaturalization, criminal convictions often serve as the triggering event that leads the government to investigate whether fraud occurred during the naturalization process. Here is how that works in practice:

A naturalized citizen is arrested and charged with a crime. During the criminal case, immigration authorities or prosecutors notice a discrepancy—the defendant's criminal history includes arrests or convictions that predate naturalization but were not disclosed on Form N-400. That discrepancy is referred to USCIS or the DOJ. An investigation is opened. The government pulls the N-400 file, obtains certified records of the prior arrests, and compares the applicant's sworn answers to the documented facts. If the applicant answered "No" to the question about arrests when the records show multiple arrests, the government has evidence of a material misrepresentation. A denaturalization complaint follows.

This pattern is especially common in cases involving organized crime, gang activity, or repeat offenders. The current criminal case provides the investigative hook; the undisclosed prior conduct provides the legal basis for denaturalization. The two cases proceed on parallel tracks—the criminal case in state or federal criminal court, and the denaturalization case in federal civil court. A conviction in the criminal case is not required for denaturalization to succeed, but it often strengthens the government's evidence that the applicant had a pattern of criminal conduct they intentionally concealed.

Denaturalization Compared to Deportation

What If You Discovered an Error on Your N-400 After Naturalizing?

If you realize after naturalizing that you made a mistake on Form N-400—omitted an arrest, misstated travel dates, failed to disclose a prior marriage—the legal calculus depends on whether the error was intentional or negligent. An honest mistake, particularly about a peripheral fact, is unlikely to support denaturalization because the government must prove willful misrepresentation or concealment. Negligence or confusion is not enough. But the line between mistake and fraud is drawn by the government, not by you, and the risk is that the government will interpret any material omission as intentional.

There is no formal process to "correct" a naturalization application after the fact. Once the oath is taken and the certificate issued, the N-400 is a closed file. What you can do is consult an immigration attorney to assess the risk and, if appropriate, prepare a detailed affidavit documenting what the error was, why it occurred, and what the correct facts are. That affidavit does not cure the misrepresentation in a legal sense, but it can serve as evidence of good faith if the government later opens an investigation. It is also evidence you can use to argue lack of willfulness.

If the omitted fact is serious—a prior deportation, a crime involving moral turpitude, membership in a prohibited organization—do not assume that silence is safer than disclosure. The government's data-matching capabilities have expanded significantly, and it is increasingly likely that discrepancies will be detected. An immigration attorney experienced in denaturalization defense can evaluate whether proactive disclosure, a declaratory judgment action, or another strategy reduces your exposure.

What If You Are Facing Denaturalization Proceedings?

If you receive a summons and complaint alleging denaturalization, you are in federal civil litigation against the United States. This is not an immigration case you can handle pro se or with a general practice attorney. Denaturalization defense requires specialized knowledge of both immigration law and federal civil procedure, because the case is litigated in district court under the Federal Rules of Civil Procedure, not in immigration court.

Your answer to the complaint is due within 21 days. The answer must respond to each allegation and assert affirmative defenses—statute of limitations (if applicable under the narrow circumstances where one exists), laches, lack of materiality, lack of intent, due process violations. Discovery follows: the government will subpoena your immigration file, criminal records, travel records, and any other evidence relevant to the fraud allegation. You have the same discovery rights and can subpoena government witnesses and documents.

The case may be decided on summary judgment if there are no disputed facts, or it may proceed to trial. At trial, the government presents its case first, and you have the right to cross-examine witnesses and present your own evidence and witnesses. If the government meets the clear-and-convincing standard, judgment enters for denaturalization. If it does not, judgment enters in your favor and citizenship is affirmed.

Settlement is possible. In some cases, the government will agree to dismiss the denaturalization complaint in exchange for the defendant's voluntary relinquishment of citizenship and departure from the U.S., or agreement to adjust status to lawful permanent resident and waive appeal rights. Whether settlement makes sense depends on the strength of the government's evidence and your individual circumstances. An attorney at the Law Offices of Peter D. Chu can evaluate those factors and negotiate on your behalf if settlement is the better path.

What If You Hold Dual Citizenship?

Dual citizenship does not insulate you from U.S. denaturalization. If you are a naturalized U.S. citizen who also holds citizenship in another country, and the U.S. government successfully denaturalizes you, you lose U.S. citizenship and revert to the status you held before naturalizing. You retain the other country's citizenship, but that does not prevent removal from the United States if you no longer have lawful immigration status here. Dual nationals face the same denaturalization standard and the same consequences as single-nationality naturalized citizens.

One wrinkle: if you acquired U.S. citizenship through your parents (derivative citizenship) rather than through your own naturalization, you generally cannot be denaturalized even if your parent is denaturalized, because your citizenship arose by operation of law under the Child Citizenship Act of 2000 or prior derivative-citizenship provisions. But if you personally applied for and were granted naturalization, your citizenship is subject to denaturalization under the fraud standard regardless of any other nationality you hold.

Defending Against Allegations of Fraud

The defense in a denaturalization case focuses on disproving one or more elements the government must establish. Common defenses include:

Lack of willfulness: You can argue that any misstatement on the N-400 was an honest mistake, not a deliberate attempt to deceive. This defense requires credible evidence—testimony, documents showing confusion or language barriers, evidence you disclosed the fact elsewhere in your immigration history. Courts are skeptical of mistake claims when the question was straightforward and the omitted fact was significant, but the defense can succeed when the applicant can show good-faith confusion.

Lack of materiality: Even if you made a false statement, the government must prove it was material—that it had a natural tendency to influence the naturalization decision. You can argue that the omitted fact would not have affected the outcome because it was minor, was already known to USCIS from other sources, or did not bear on any statutory eligibility requirement. Materiality is a question of law for the court, informed by the facts.

Government misconduct or due process violations: If the government violated discovery rules, destroyed evidence, coerced statements, or otherwise acted improperly, those violations can be grounds for dismissal or suppression of evidence. This defense is fact-intensive and requires careful documentation of what the government did and when.

Statute of limitations (narrow applicability): For denaturalization based on wartime service fraud or procurement through an organization advocating overthrow of the government, there are specific time limits. These are rare cases. For the standard fraud-based denaturalization under § 1451(a), there is no statute of limitations, but laches (unreasonable delay causing prejudice) may be available as an equitable defense if the government sat on known evidence for decades.

Successful defense often turns on documentary evidence the government does not have or cannot authenticate, inconsistencies in the government's case, or witness testimony that contradicts the fraud allegation. This is a litigation-intensive process, not a matter of filing a motion and hoping for the best.

When USCIS Refers Cases for Denaturalization

USCIS does not file denaturalization cases itself. When USCIS identifies a potential fraud case—through a background check discrepancy, a subsequent immigration application that contradicts the N-400, a tip, or a random file audit—it refers the case to the Department of Homeland Security Office of Immigration Litigation or the DOJ Civil Division. Those offices conduct their own investigation, often reopening the entire immigration file, interviewing witnesses, and obtaining new records. If they conclude the case is strong, they draft and file the civil complaint in the district where the defendant resides.

Not every referral becomes a filed case. The government must evaluate whether the evidence is sufficient to meet the clear-and-convincing standard, whether the defendant is likely to be locatable and subject to service of process, and whether the case is a priority given limited litigation resources. High-priority cases include those involving national security concerns, organized crime, war crimes, human rights violations, and immigration benefit fraud rings. Routine misstatements—such as a minor discrepancy in travel dates or a single undisclosed traffic citation—are unlikely to be prosecuted unless part of a broader pattern.

When USCIS conducts a naturalization file audit and identifies a discrepancy, it may schedule you for an interview under oath to clarify the facts before making a referral. Anything you say in that interview can and will be used as evidence in a denaturalization case. You have the right to bring an attorney to that interview, and you should exercise it. Attempting to explain away the discrepancy without legal guidance often creates additional false statements that strengthen the government's case.

Citizenship Rights Are Not Easily Restored

If you are denaturalized, you do not automatically regain the ability to naturalize again. Denaturalization based on fraud makes you ineligible for future naturalization unless and until you can demonstrate rehabilitation and satisfy USCIS that you now meet the good moral character requirement—a standard that becomes significantly harder to meet after a finding of fraud under oath. In practice, many denaturalized individuals are placed in removal proceedings and removed from the United States, making future naturalization a distant and uncertain possibility.

Even if you are not removed—for example, because you revert to lawful permanent resident status and are allowed to remain—you carry the denaturalization judgment as part of your immigration record. Any future application for an immigration benefit will be scrutinized in light of that history. USCIS will presume you are not credible, and you will bear the burden of overcoming that presumption with corroborating evidence.

This is why defending against denaturalization is not optional if you receive a complaint. The stakes are not just loss of citizenship—they include potential removal, criminal prosecution, and permanent exclusion from future immigration benefits.

The Consultation and Case Evaluation Process

If you are concerned about discrepancies in your naturalization application, have received a USCIS audit notice, or have been served with a denaturalization complaint, the Law Offices of Peter D. Chu offers case evaluations to assess your risk and options. An initial consultation involves reviewing your immigration history, the specific facts you disclosed or did not disclose on Form N-400, and any criminal or immigration records that might trigger scrutiny. That review allows the firm to evaluate the strength of a potential government case and the viability of defenses.

Denaturalization defense requires accessing your full USCIS file (A-file) through a Freedom of Information Act request, obtaining certified copies of any criminal records, and analyzing whether the government can meet its burden of proof. The consultation fee for an in-person or virtual meeting is $250, and the firm can be reached at 858-268-8823 or through https://www.peterchu.com/pages/citizenship. The office is located at 4615 Convoy St, San Diego, CA 92111, and office hours are Monday through Friday, 8:30 AM to 5:30 PM. The firm serves clients in English, Mandarin, Cantonese, Vietnamese, and French.

Denaturalization cases move quickly once filed. The time to prepare a defense is before the complaint arrives, not after. If you know there is a problem in your file, addressing it proactively—whether through legal strategy, documentation, or risk assessment—puts you in a stronger position than waiting for the government to act.

Legal Disclaimer: This article provides general information about U.S. denaturalization law and is not legal advice. It does not create an attorney-client relationship between you and the Law Offices of Peter D. Chu. Denaturalization cases are highly fact-specific, and outcomes depend on individual circumstances, the evidence the government has, and the legal strategy employed. Do not rely on this article to evaluate your specific situation or make decisions about your case. Consult a licensed immigration attorney for advice tailored to your facts.

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