The Supreme Court will decide in November 2025 whether Trump’s use of emergency powers to impose broad tariffs is legal.

On November 5, 2025, the U.S. Supreme Court will hear challenges to President Trump’s use of the International Emergency Economic Powers Act to impose high tariffs on imports, including from Canada. The cases, brought by small U.S. businesses, contest the legality of using IEEPA—a law not designed for broad tariffs—to justify trade measures. Lower courts have previously ruled against the administration, and a Supreme Court decision against Trump could invalidate billions in tariffs, disrupt trade agreements, and limit future presidential trade powers. The outcome may reshape U.S. trade policy and presidential authority.