The Supreme Court took up one of the most consequential immigration cases in decades on Wednesday, hearing oral arguments over whether the Trump administration can limit birthright citizenship through executive action. President Trump attended the session in person, an unusual appearance that underscored the administration's priority on the issue.

At stake is the scope of the 14th Amendment, ratified in 1868, which states that all persons born or naturalized in the United States and subject to its jurisdiction are citizens. The administration's executive order, issued in the early days of Trump's second term, sought to deny citizenship to children born on U.S. soil to parents who are in the country illegally or on temporary visas. Federal courts blocked the order, setting the stage for the Supreme Court review.

During arguments, justices from across the ideological spectrum pressed government attorneys on both the constitutional interpretation of the 14th Amendment and the procedural question of whether lower courts had authority to issue the nationwide injunctions that halted the policy. The administration has argued that children born to parents without legal permanent status are not fully "subject to the jurisdiction" of the United States in the sense the amendment intended.

Opponents of the executive order, including civil liberties groups and a coalition of states, contend that the plain text and longstanding precedent firmly establish birthright citizenship as a constitutional right that cannot be undone without a constitutional amendment. Legal scholars have widely noted that the Supreme Court affirmed birthright citizenship in its 1898 decision in United States v. Wong Kim Ark.

The court's ruling, expected before the end of its current term in June, could reshape the legal status of hundreds of thousands of children born each year in the United States to non-citizen parents. It would mark the first time the Supreme Court has directly addressed the scope of birthright citizenship in the modern era.