Donald Trump had been warning for months that a Supreme Court decision curtailing his ability to impose tariffs would be an “economic and national security disaster” with “catastrophic” consequences. A six-justice majority of the Supreme Court, in ruling against the president today, didn’t care much about his concerns.

Congress, not the president, has the power to impose tariffs, the justices held. And nothing in the law that the president cited in his legal defence, the Emergency Economic Powers Act of 1977, delegated such sweeping powers to Trump.

The court’s decision represents a rare check on this president’s broad use of executive authority. A majority of the justices over the past year have shown a willingness to allow Trump to press ahead with his agenda, particularly on immigration and reshaping the federal government, even as legal challenges work their way through the court system.

This case, considered on an expedited basis, slams the door on one such expansive use of presidential authority.

With several other major cases involving controversial uses executive power – such as efforts to end birthright citizenship and to dismiss a Federal Reserve governor based on alleged improprieties – this may not be Trump’s only setback in the coming months.