Can Foreign-Born Citizens Be Denaturalized for Post-Naturalization Behavior and Beliefs?
Yes, but …
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By George Fishman on March 24, 2026
It is a Trump administration civil law enforcement priority to “prioritize and maximally pursue denaturalization proceedings in all cases permitted by law and supported by the evidence”. There has been significant recent discussion of the possible denaturalization of naturalized immigrants involved in terrorism, welfare fraud, or other crimes. This paper examines whether and under what circumstances a naturalized citizen might be stripped of citizenship for actions or statements that occur after he or she has become a U.S. citizen.
Summary
The Constitution grants Congress alone the authority to prescribe rules for naturalization. Federal law has long required that to become a naturalized citizen, a lawful permanent resident must be “a person of good moral character, attached to the principles of the Constitution of the United States, and well disposed to the good order and happiness of the United States” and must take an oath to support and defend the Constitution and renounce all allegiance and fidelity to their prior country of citizenship.
The Supreme Court has explained that “[c]itizenship obtained through naturalization is not a second-class citizenship” but “carries with it the privilege of full participation in the affairs of our society”. It has concluded that “once citizenship has been acquired, its loss can have severe and unsettling consequences”, and the government “carries a heavy burden of proof” in a denaturalization proceeding. However, at the same time the Court made clear that “there must be strict compliance with all the congressionally imposed prerequisites to the acquisition of citizenship” and “Failure to comply with any of these … renders … citizenship ‘illegally procured,’ and naturalization that is unlawfully procured can be set aside.” Denaturalization does not constitute punishment. It is, rather, as a federal court has put it, an “undoing of that which should not have been done in the first place”.
Under federal law, the federal government can seek to denaturalize, or revoke the citizenship, of those who illegally procured naturalization or procured it by concealment of a material fact or by willful misrepresentation.
The Supreme Court has ruled that in a denaturalization proceeding, in order to prove that a citizen lacked attachment to the Constitution at the time of naturalization, the government must provide “‘clear, unequivocal, and convincing’ evidence which does not leave the issue in doubt”. However, the Court has seemingly indicated that Congress would have the power to substitute a lower standard of proof.
It is fair to conclude that under the Constitution, naturalization may only be revoked where it was illegally procured. So, to what extent, if any, can the government revoke naturalization based on behavior engaged in or beliefs expressed post-naturalization?
As one federal court has concluded, post-naturalization behavior and beliefs “can at best rise only to the level of evidential facts” as to a citizen’s behavior and beliefs at the time of naturalization. While the Supreme Court has expressed dubiousness as to the “logical validity” of the “presumption that disqualifying views expressed after naturalization [are] accurate representations of [a citizen’s] views when he took the oath”, the Court has “not h[e]ld that evidence of subsequent acts would as a matter of law be insufficient proof of an earlier fraudulent intent”, as one federal court has put it.
As another federal court has explained, “Certainly allegiance to our Government and the principles of its Constitution can not have been very deep or sincere if it could so easily be supplanted within a few years by an ideology [in this case Nazism] which is the complete antithesis of everything for which our Constitution stands.” The Senate Judiciary Committee explained in 1950 that federal courts had been of the opinion that “if loyalty was unable to stand the test of an armed conflict against the naturalized person’s country of origin, it was absent from the beginning”. The committee concluded, however, that during World War II the Supreme Court had begun to hold the government “to such a strict standard of proof that it became very difficult to” denaturalize citizens with Nazi sympathies. The committee thus recommended enactment of a new federal law providing that “joining a [subversive] organization within 5 years after naturalization shall be presumptive evidence that naturalization was obtained by a willful misrepresentation or by concealment of a material fact”. But the committee “emphasize[d] that this … is not intended to place a condition subsequent upon naturalization”, but rather simply to “create a rule of evidence” as to whether naturalization was obtained unlawfully.
The committee’s recommendation was enacted into law in the Internal Security Act of 1950 and (in modified form) remains good law today:
If a person … shall within five years next following … naturalization become a member of or affiliated with any organization, membership in or affiliation with which at the time of naturalization would have precluded such person from naturalization … , it shall be considered prima facie evidence that such person was not attached to the principles of the Constitution of the United States and was not well disposed to the good order and happiness of the United States at the time of naturalization, and, in the absence of countervailing evidence, it shall be sufficient in the proper proceeding to authorize the revocation [of their citizenship].
One difficulty in assessing the presumption’s constitutionality is that it has rarely been invoked and, as far as I can tell, has not been the subject of a federal court decision. But we can look for guidance to federal court decisions regarding other statutory denaturalization presumptions taking the “prima facie evidence/countervailing evidence” form.
In 1913, the Supreme Court utilized a test that in order for “a legislative presumption of one fact from evidence of another … not [to] constitute a denial of due process of law, or a denial of the equal protection of the law, it is only essential that there shall be some rational connection between the fact proved and the ultimate fact presumed, and that the inference of one fact from proof of another shall not be so unreasonable as to be a purely arbitrary mandate”. The Court concluded that the denaturalization presumption it was reviewing met this test. However, the Court noted that “Congress has indicated its opinion that the intervening period may be as much as five years without rendering the presumption baseless. That period seems long.” The Court stated that “yet we are not prepared to pronounce it certainly excessive or unreasonable”, but cautioned “we are of opinion that, as the intervening time approaches five years, the presumption necessarily must weaken to such a degree as to require but slight countervailing evidence to overcome it”. However, “On the other hand, when the intervening time is so short as it is shown to have been in the present case, the presumption cannot be regarded as yielding to anything short of a substantial and convincing explanation.”
In 1980, the Ninth Circuit considered essentially the same statutory provision and concluded that “[it] is a valid exercise of Congress’ authority to enact rules of evidence and procedure”, noting that the Supreme Court had upheld the constitutionality of the predecessor statute. The court concluded that “Any danger that the presumption is too broad is eliminated by [the] requirement that the strength of the presumption vary with length of time elapsed between naturalization and the [post-naturalization act]. We conclude that [the statute] is a rational exercise of Congressional judgment.”
In sum, the government can constitutionally utilize evidence of post-naturalization behavior/beliefs in order to demonstrate that a citizen had unlawfully procured naturalization, and thus in order to revoke their citizenship. It is also constitutional to rely on prima facie evidence/countervailing evidence presumptions — as long as there is a rational connection between the proscribed post-naturalization act and the citizen’s state of mind at the time of naturalization. However, the longer the length of time between naturalization and the commission of the proscribed act, the less convincing evidence the citizen has to provide to defeat the presumption.
https://cis.org/Report/Can-ForeignBorn-Citizens-Be-Denaturalized-PostNaturalization-Behavior-and-Beliefs
