The United States Supreme Court is holding a hearing today on whether President Donald Trump’s use of the International Emergency Economic Powers Act (IEEPA) to impose tariffs violates congressional law. This case, Learning Resources, Inc. v. Trump and Trump v. V.O.S. Selections, Inc., will determine if presidents can declare an ‘economic emergency’ under IEEPA to justify tariffs without explicit congressional authorization. The lower courts have already ruled against the administration in May (Court of International Trade) and August (Federal Circuit). The court’s decision is crucial, as a 6-3 conservative majority with three Trump-appointed justices could significantly impact trade policy.