U.S. appeals court judges challenge President Trump's use of emergency powers to impose broad tariffs. The court examines the legality under the International Emergency Economic Powers Act, with opposing legal arguments highlighting constitutional concerns.

US Justice Department lawyers defended President Donald Trump’s authority to unilaterally impose global tariffs during a high stakes appeals court hearing Thursday, a day before another round of levies against many countries are set to kick in.

The U.S. Court of Appeals for the Federal Circuit is considering the legality of "reciprocal" tariffs Trump imposed on U.S. trading partners.