FACT CHECK: Experts Debunk Trump's Claim That Congress Can Overturn Birthright Citizenship by Legislation

Following the Supreme Court's landmark June 30 ruling striking down his executive order on birthright citizenship, President Donald Trump made a bold assertion to his supporters. He claimed that a long and unwieldy constitutional amendment was no longer necessary to end the practice. Instead, the president argued that Congress could simply pass a standard law to deny automatic citizenship to children born in the United States to undocumented immigrants and temporary visa holders. We can easily make it up in Congress through Legislation, he wrote on his Truth Social platform, urging lawmakers to act immediately and promising his complete support for the measure. The statement was a direct pivot from his defeated executive action, signaling a new legislative strategy for his administration's immigration agenda.

The president's claim quickly gained traction among his political allies on Capitol Hill, who began discussing bills to amend federal immigration statutes in the wake of the Court's decision. However, a broad consensus of constitutional scholars, immigration experts, and even prominent conservative lawyers has firmly debunked the president's legal theory. Legal experts point out that the specific reasoning used by the Supreme Court majority in Trump v. Barbara explicitly blocks the legislative path Trump is now proposing. Because the Court anchored its decision in the bedrock of the U.S. Constitution, an ordinary act of Congress is powerless to override it.

The core of the experts' argument rests on the exact text of the Supreme Court's 6-3 decision. While the ruling was a definitive defeat for the administration's executive order, the legal scaffolding used by the majority is what matters for future legislative attempts. Chief Justice John Roberts, writing for a five-justice majority, explicitly rooted the protection of birthright citizenship in the Fourteenth Amendment of the U.S. Constitution. The Citizenship Clause, ratified in 1868 following the Civil War to ensure formerly enslaved people were recognized as citizens, states that all persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States.

In his majority opinion, Chief Justice Roberts wrote that the framers of the Fourteenth Amendment extended the promise of citizenship to every freeborn person in the land. The Court concluded that children born to parents who are unlawfully or temporarily present in the country are indeed subject to U.S. jurisdiction, and thus are citizens at birth. Because the ruling is anchored directly in the Constitution rather than in a misinterpretation of a federal statute, legal experts note that it supersedes any ordinary law that Congress might attempt to pass. The Constitution sits at the absolute top of the American legal hierarchy.

Unless the Supreme Court changes its interpretation in a future case, Congress cannot override the Constitution by statute, explained Garrett Epps, a constitutional expert and professor of practice at the University of Oregon School of Law. A fundamental tenet of American civics is that a simple legislative act cannot rewrite a constitutional guarantee. Just as Congress cannot pass a law to eliminate the First Amendment's protection of free speech or the Second Amendment's right to bear arms, it cannot legislate away the Fourteenth Amendment's guarantee of birthright citizenship. Any attempt to do so would be a violation of the separation of powers.

So where did the president's theory originate? The confusion—and the specific legal lifeline that Trump's congressional allies are now clinging to—stems entirely from a concurring opinion written by Justice Brett Kavanaugh. Kavanaugh agreed with the majority that Trump's executive order was unlawful and had to be struck down, making the final vote 6-3 against the administration. However, he sharply disagreed with the majority's constitutional reasoning, offering an entirely different legal rationale for his decision to invalidate the president's directive.

Justice Kavanaugh argued that the executive order merely violated an existing federal statute, specifically 8 U.S.C. Section 1401(a), which codifies birthright citizenship into federal law. In his separate writing, Kavanaugh explicitly suggested the legislative route that Trump is now championing. Congress could—consistent with the Fourteenth Amendment—amend Section 1401(a) or otherwise enact new legislation establishing exceptions to birthright citizenship for children born to foreign citizens unlawfully or temporarily in the country, Kavanaugh wrote, noting that lawmakers simply had not yet done so. This single paragraph became the foundation for Trump's new legislative push.

While Justice Kavanaugh's concurring opinion provides a theoretical roadmap for legislation, legal experts emphasize a crucial mathematical reality: Kavanaugh was writing only for himself. His view that the Fourteenth Amendment allows for legislative exceptions was not adopted by the five justices in the majority—Chief Justice Roberts, along with Justices Elena Kagan, Sonia Sotomayor, Amy Coney Barrett, and Ketanji Brown Jackson. Because five justices established a clear constitutional rule, Kavanaugh's statutory argument does not carry the force of binding precedent. It is merely an expression of his individual judicial philosophy.

There is no language in the majority opinion that suggests Congress could change the birthright citizenship rule of the Fourteenth Amendment by statute, Epps noted in his analysis of the ruling. Because the Supreme Court has now formally recognized this as a constitutional right, any bill passed by Congress to restrict birthright citizenship would be immediately challenged and struck down by lower courts. Federal district and appellate judges are strictly bound by the Supreme Court's new precedent, leaving no room for a legislative workaround to survive judicial review.

Even prominent conservative legal minds who personally oppose birthright citizenship have publicly acknowledged this reality, warning their political allies not to waste time on doomed legislation. Florida Governor Ron DeSantis, a Harvard-educated lawyer, noted on social media that the Supreme Court's decision was substantive, not merely procedural. He explained that the ruling definitively interpreted the Fourteenth Amendment as requiring citizenship for those born to unauthorized immigrants, meaning the legislative door is closed. DeSantis and others recognize that passing a bill would only result in another swift defeat in the courts.

To actually change the law of the land and end birthright citizenship, the United States would have to undertake the arduous and historically rare process of amending the Constitution. This requires a two-thirds supermajority vote in both the House of Representatives and the Senate. If it passes that massive hurdle in a deeply polarized Washington, the amendment must then be ratified by three-fourths of the state legislatures, meaning 38 out of 50 states must approve it. Given the current political climate, experts consider this path practically impossible in the near term.[1]

Alternatively, a future Supreme Court with a different ideological makeup could theoretically choose to overturn Trump v. Barbara. The three dissenting justices in the case—Clarence Thomas, Samuel Alito, and Neil Gorsuch—already signaled their willingness to interpret the Citizenship Clause much more narrowly, aligning closer to the administration's original arguments. If the balance of the Court shifts in the coming decades through retirements and new appointments, a new conservative majority could revisit the issue and adopt the legal framework proposed by the dissenters.

However, relying on a future reversal is a steep and uncertain gamble for lawmakers. The Supreme Court generally adheres to stare decisis, the foundational legal doctrine of respecting past precedents. Overturning a major constitutional ruling, especially one established so forcefully by a cross-ideological majority that included conservative stalwarts like Chief Justice Roberts and Justice Barrett, is exceptionally rare. For now, the legal consensus remains unambiguous: Congress does not have the power to overturn birthright citizenship through standard legislation, and the constitutional door has been firmly shut.[2]

For the hundreds of thousands of immigrant families and expecting parents who were caught in the legal limbo of the executive order, the consensus among legal experts offers a profound sense of relief. The confirmation that birthright citizenship is shielded by the Constitution means that their children's status cannot be wiped away by the stroke of a presidential pen or a sudden shift in congressional majorities. As the dust settles on one of the most consequential Supreme Court terms in recent memory, the Fourteenth Amendment stands exactly as it has for over a century—protecting the citizenship of anyone born on American soil.[2]