A federal trade court ruled President Trump didn’t have the authority to impose sweeping tariffs on virtually every nation, voiding the levies that have sparked a global trade war and threatened to upend the world economy.

The decision on Wednesday from the Court of International Trade blocked one of the Trump administration’s most audacious assertions of executive power, under the International Emergency Economic Powers Act of 1977. Shortly after the decision was handed down, lawyers for the Trump administration notified the court they will appeal.