The Supreme Court will hear whether President Donald Trump exceeded federal law by using emergency powers to impose sweeping tariffs that anchor his foreign policy. Lower courts said he overstepped the International Emergency Economic Powers Act, though the levies remain while the case proceeds. Trump calls the fight one of the most important in U.S. history and warns a loss would be a disaster. His administration argues tariffs are a foreign affairs tool; critics point to strained allies, higher costs, and a recent EU deal that settled at 15% as Europe sought support for NATO and security guarantees for Ukraine.

Prepared by Lauren Mitchell and reviewed by editorial team.