This case could limit presidential power over trade policy, setting an important precedent for how much authority future presidents have to impose tariffs—a big deal for businesses and international trade. If the court rules against Trump, it may force future administrations to work more closely with Congress on trade decisions.

Members of the 11-judge panel appeared unconvinced by the Trump administration’s insistence that the president could impose tariffs without congressional approval.

A U.S. appeals court seems doubtful about former President Trump's claim that he could unilaterally impose tariffs without Congress's approval, with judges appearing unconvinced by his administration's arguments.