A high-stakes court case could alter the power of federal judges to block presidential actions nationwide. At the center of the dispute is an executive order from President Trump targeting birthright citizenship. But the key focus in the case is whether a single district judge can stop a presidential order for the entire country.

One of the most powerful tools available to judges, the nationwide injunction, took center stage at the Supreme Court on Thursday. Justice Sonia Sotomayor raised the historical context of such rulings, asking whether "we've had universal injunctions in some form since the founding," and clarifying, "In equity, correct?"

President Trump's executive order, which sought to end birthright citizenship for children of non-citizen parents, was halted by several distric

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