The U.S. Supreme Court will weigh in on the legality of Donald Trump’s global tariffs, a cornerstone of his economic and trade policy, setting the stage for a major constitutional showdown over presidential power. The justices have fast-tracked the case, with oral arguments scheduled for early November. At issue is whether Trump overstepped his authority by invoking the 1977 International Emergency Economic Powers Act (IEEPA) to impose sweeping tariffs moves that could affect trillions of dollars in customs duties over the next decade. A federal appeals court previously ruled that Trump exceeded his powers, potentially threatening one of his signature policies. However, the tariffs remain in place during the appeal. The case could have far-reaching implications for future administrations and the limits of executive action on trade.