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.

This week’s ruling blocking many of the president’s tariffs will not lift those on Canadian cars, steel and aluminum. A trade expert explains what’s next.