A little-known federal court threw a giant monkey wrench into a foundational part of President Donald Trump’s economic agenda by striking down most of the sweeping tariffs he has imposed since taking office.

Federal judges ruled that the president had gone beyond his authority in imposing levies on goods imported from around the world.

The United States Court of International Trade has struck down most of Trump’s tariffs. The court determined the IEEPA doesn’t give the president “unbounded authority.” A 25% tariff remains on cars and automotive parts as it was justified under another law.