Vice President JD Vance reacted to the Supreme Court’s rejection of President Donald Trump’s executive order ending birthright citizenship, calling the 5–4 decision a “major, major mistake.” He argued that the ruling could encourage pregnant foreign nationals to enter the U.S. temporarily, deliver a child, and then claim full citizenship benefits for that child and family. Vance described the concept of birthright citizenship as “hanging by a thread,” citing the narrow margin, and urged continued border enforcement and legislative action to reverse the court’s decision. Justice Brett Kavanaugh noted in a separate opinion that Congress could alter the rule through legislation. Trump responded by calling on lawmakers to address what he termed expensive and unfair birthright citizenship.