The following section presents one dissenting view in the Supreme Court’s June 30, 2026 ruling on birthright citizenship (Trump v. Barbara), written by Justice Clarence Thomas and joined by Justice Neil Gorsuch. Students are encouraged to read it alongside the majority opinion, Justice Kavanaugh’s separate opinion, Justice Alito’s dissent, and the main lesson narrative, then weigh the competing historical arguments and draw their own conclusions. This remains an active legal and constitutional debate. The Court’s judgment was supported by five Justices in the majority, with Justice Kavanaugh concurring in the judgment on statutory grounds and dissenting from the constitutional holding.

The Case and What It Decided

On June 30, 2026, the Supreme Court decided Trump v. Barbara, a major constitutional case about birthright citizenship. The question was whether President Trump’s Executive Order No. 14160 — which sought to deny citizenship to children born in the United States to parents who were either unlawfully present or present on temporary visas — was lawful under the 14th Amendment’s Citizenship Clause and the federal citizenship statute.

The Court struck down the executive order. Chief Justice Roberts wrote for a five-Justice majority on the constitutional question, holding that children born in the United States to parents unlawfully or temporarily present are ‘subject to the jurisdiction’ of the United States and are citizens at birth under the 14th Amendment.

The lineup was nuanced. Justice Kavanaugh agreed the executive order was unlawful but only because it violated a federal statute, not because the Constitution itself resolved the issue. Three justices — Thomas, Alito, and Gorsuch — dissented entirely. Justice Thomas’s dissent presents a detailed originalist challenge to the modern understanding of birthright citizenship.

The Core Dispute: What Does ‘Subject to the Jurisdiction’ Mean?

The 14th Amendment’s Citizenship Clause reads: ‘All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States.’ Everyone in this case agreed on what ‘born in the United States’ means. The entire dispute turned on four words: subject to the jurisdiction thereof.

The majority, following the 1898 precedent United States v. Wong Kim Ark, interpreted ‘subject to the jurisdiction’ to mean: subject to the governing power of the United States — which applies to virtually everyone physically present in the country, with narrow exceptions for diplomats, foreign military forces in hostile occupation, and historically members of Indian tribes governing themselves as separate sovereignties.

Justice Thomas argued that ‘the Civil Rights Act and the Citizenship Clause guaranteed citizenship to persons born and domiciled in the United States regardless of their race — but that neither guaranteed citizenship to persons who were not domiciled in the United States.’ The word domicile is central to his argument. Domicile means more than physical presence — it means the place where a person has established a permanent legal home. On Thomas’s reading, the 14th Amendment was written to guarantee citizenship to those born to parents domiciled in America, not to every child whose parents happened to be on American soil at the moment of birth.

Thomas’s Historical Argument

Justice Thomas is an originalist — he believes the Constitution’s meaning is fixed at the time it was written, and that interpreting it correctly requires understanding what its words meant to the people who wrote and ratified it. His dissent is primarily a historical argument: that the majority’s interpretation of ‘subject to the jurisdiction’ gets the history wrong.

1. The 14th Amendment was written to fix a specific problem — Dred Scott — not to create universal birthright citizenship for all children of foreign visitors.

Thomas argued that the 14th Amendment was primarily aimed at formerly enslaved Black people. The Citizenship Clause’s purpose, he argued, was to overturn Dred Scott v. Sandford (1857) and guarantee citizenship to the freed slaves and their descendants — people who had been born on American soil, had no other homeland, owed no allegiance to any foreign power, and had in every practical sense made America their home. On his reading, the Clause was designed to protect people in that specific situation, not to extend automatic citizenship to the children of anyone physically present in the United States.

2. ‘Subject to the jurisdiction’ historically meant complete political allegiance, which required domicile.

Thomas argued that in the constitutional era, ‘jurisdiction’ in the context of citizenship carried a specific legal meaning tied to allegiance. A person was fully ‘subject to the jurisdiction’ of the United States only when they owed primary political allegiance to the United States — and that allegiance was established by domicile, by having made the United States one’s permanent home. A foreign visitor on a temporary stay, in his reading, retained primary allegiance to their home country and thus was not fully ‘subject to the jurisdiction’ in the sense the 14th Amendment intended.

3. Wong Kim Ark (1898) was more limited than the majority claims.

Thomas contended that Wong Kim Ark resolved only the narrow issue of citizenship of a child born in the United States to parents who had established a permanent domicile in the country. He argued that the famous 1898 precedent has been over-read — that it settled the question for children of permanent residents, but did not necessarily settle it for children of temporary visitors or those unlawfully present.

The Majority’s Response

Chief Justice Roberts and the majority engaged Thomas’s historical argument at length — and rejected it sharply. Roberts wrote that domicile and national citizenship are distinct concepts: ‘one who establishes a domicile in a new country does not automatically become a citizen thereof, nor does he automatically lose his prior citizenship.’ The majority found that the word ‘domicile’ appears only twice in all the congressional debates over both the Civil Rights Act of 1866 and the 14th Amendment — and in neither case was it used to define the scope of birthright citizenship.

The majority also pointed to the congressional debates, where Senator Trumbull — a key author of the Civil Rights Act — said the law would make citizens of ‘the children of Chinese and Gypsies born in this country,’ and ‘even the infant child of a foreigner born in this land is a citizen.’ The Court treated these statements as evidence that the Reconstruction Congress chose broad language rather than a domicile requirement.

Justice Jackson, in a pointed concurrence, argued that Thomas’s position created a tension: although he has often emphasized a ‘colorblind’ Constitution, his reading of the Citizenship Clause treated it as a race-conscious remedial measure focused on formerly enslaved people and those similarly situated. Jackson argued that this narrow reading was inconsistent with the universal language the Framers of the 14th Amendment actually chose.

Justice Kavanaugh’s Middle Path

Justice Kavanaugh agreed that Trump’s executive order was unlawful — but not for the constitutional reason the majority gave. In his view, Trump’s order ‘does not violate the Fourteenth Amendment’ but does violate a federal law providing that children who are ‘born in the United States, and subject to the jurisdiction thereof’ are U.S. citizens. Congress, Kavanaugh suggested, ‘could amend that law or otherwise enact new legislation establishing exceptions to birthright citizenship for children born to foreign citizens unlawfully or temporarily in the country. But Congress has not yet done so.’

Kavanaugh’s position is significant: at least four sitting Justices took the view that the Constitution does not, by itself, guarantee birthright citizenship to children of parents unlawfully or temporarily present, and that Congress could alter the statutory rule without a constitutional amendment. The majority rejected that view as a matter of constitutional interpretation.

Why This Connects to Lesson 54

The 14th Amendment was ratified in 1868 to ensure that the freed slaves and their descendants could never again be denied citizenship — to permanently overrule Dred Scott and make citizenship a matter of birth on American soil rather than race or ancestry. That was its central, undisputed purpose.

The debate in Trump v. Barbara is about what else the Amendment accomplished. Did it enshrine a broad, universal principle — that virtually anyone born on American soil is a citizen, regardless of their parents’ status? Or did it enshrine a narrower principle — that no one who has made America their home can be denied citizenship on account of race or origin — while leaving Congress free to define who qualifies as having made America their home?

Both sides of this debate claim to be faithful to the text and history of the 14th Amendment. Both sides claim to be honoring the meaning of Reconstruction. This is what makes Trump v. Barbara important for students of the 14th Amendment: it forces a genuine reckoning with what the Amendment’s words mean, what problem they were written to solve, and whether the solution is narrow and targeted or broad and universal.

Questions for Discussion

1. Justice Thomas argues that the 14th Amendment was written primarily to guarantee citizenship to the freed slaves, and that the majority has expanded it beyond that original purpose. Chief Justice Roberts argues the Amendment was written in universal language precisely to prevent any future government from drawing racial or ancestral lines around citizenship. Which interpretation do you find more historically persuasive, and why?

2. Justice Kavanaugh’s middle position suggests that Congress could change statutory birthright citizenship rules even though the majority held the Constitution itself protects birthright citizenship in this context. What are the advantages and disadvantages of leaving such questions to the legislative process rather than resolving them constitutionally?

3. The majority points out that the word ‘domicile’ appears only twice in all the congressional debates over the 14th Amendment and was never used to define the scope of birthright citizenship. Justice Thomas responds that the concept of allegiance — which domicile was understood to establish — was central to the framers’ thinking even if the word ‘domicile’ wasn’t used. How should courts weigh explicit textual evidence against implicit conceptual frameworks when interpreting constitutional history?

4. Given the Court’s ruling, what options remain for those who want to change birthright citizenship rules? What would require ordinary legislation, and what would require a constitutional amendment?

For Further Reading

Trump v. Barbara, 609 U.S. ___ (2026) — the full opinion including Roberts’s majority, Jackson’s concurrence, Kavanaugh’s partial concurrence/dissent, Thomas’s dissent, Alito’s dissent, and Gorsuch’s separate dissent: https://www.supremecourt.gov/opinions/25pdf/25-365_4hdj.pdf

United States v. Wong Kim Ark, 169 U.S. 649 (1898) — the foundational 1898 precedent that Trump v. Barbara interpreted and reaffirmed.

The 14th Amendment, Section 1 (ratified 1868) — the primary constitutional text at issue.

The Civil Rights Act of 1866 — the statutory predecessor to the Citizenship Clause, whose congressional debates are central to both sides’ historical arguments.