The Supreme Court ruled this morning that the Constitution guarantees birthright citizenship to virtually all children born in the United States, and that Trump’s executive order trying to end it is unconstitutional.

The vote was 6-3. Chief Justice John Roberts wrote the majority opinion.

What Trump tried to do

On his first day back in office, Trump signed an executive order barring automatic citizenship for babies born in the U. S. to parents who entered the country without authorization or who are living here on temporary visas.

The administration argued that the 14th Amendment’s phrase “subject to the jurisdiction thereof” gave them room to redefine who qualifies. Courts disagreed almost immediately. Multiple federal judges blocked the order before it could take effect, and the cases worked their way up to the Supreme Court.

What the court said

Roberts, writing for the majority, cited both colonial precedent and abolitionist tradition. He called birthright citizenship an “ancient and universal” rule, and he rejected the administration’s jurisdictional argument directly: children born here to undocumented parents or parents on temporary visas “satisfy both elements of the Citizenship Clause,” Roberts wrote. “Under the Constitution, they are citizens at birth.”

The three justices who dissented weren’t named in the majority’s early coverage, but the 6-3 breakdown tracks with the court’s conservative bloc partially crossing over, Roberts being the most likely to anchor the majority alongside the court’s three liberal justices.

How Trump is responding

Trump posted on Truth Social shortly after the ruling: “The Supreme Court upheld Birthright Citizenship, which is too bad for our Country, but we can easily make it up in Congress through Legislation.”

That’s not quite accurate. Overturning birthright citizenship through legislation alone wouldn’t survive constitutional challenge. Ending it permanently would require a constitutional amendment, which needs a two-thirds supermajority in both chambers of Congress and ratification by 38 states. Trump’s party doesn’t have those numbers.

Reactions

Civil rights groups are calling this a flat victory.

“The court’s decision reaffirms a fundamental American promise: if you are born here, you are a citizen.” — Cecillia Wang, ACLU National Legal Director

LULAC CEO Juan Proaño said the organization isn’t fully celebrating yet: “I’m expecting that this president will basically try and retaliate in some form or another.”

The ACLU’s Cody Wofsy offered a more direct read: “We don’t anticipate that there will be a round two of this fight over birthright citizenship. The Supreme Court has rejected it and rejected it emphatically.”

What this means going forward

For the 150,000 or so babies who would have been affected each year under Trump’s order, the ruling means their citizenship status remains what it’s always been. For the administration, it’s another high-profile legal defeat on immigration, following court blocks on deportation policy, travel bans, and federal funding conditions tied to immigration enforcement.

Trump’s instinct to reframe the loss as a congressional opportunity gives his base a rally point, but there’s no realistic path to a constitutional amendment without bipartisan support he doesn’t have.

For more on immigration policy and the courts, see Phundi’s Politics section.

Related: Trump’s Election Rule Changes Are Getting Blocked Everywhere. Now He’s Threatening Funding.