Supreme Court Questions Legality of Trump's Global Tariffs

On November 5, 2025, the U.S. Supreme Court heard arguments challenging President Donald Trump's use of the 1977 International Emergency Economic Powers Act (IEEPA) to impose global tariffs. Justices from both conservative and liberal backgrounds expressed skepticism about the administration's interpretation of IEEPA, particularly concerning its application to impose taxes—a power traditionally held by Congress.

Chief Justice John Roberts noted that the law had "never before been used to justify tariffs," questioning the administration's novel application. Justice Neil Gorsuch highlighted concerns about the potential erosion of congressional authority, emphasizing that the power to tax has been distinct since the nation's founding.

The case centers on whether the IEEPA grants the president the authority to unilaterally impose tariffs without direct congressional approval. Challengers, including states and small businesses, argue that the tariffs are illegal under IEEPA and economically harmful, with projections of $3 trillion in increased costs over a decade.

While the outcome remains uncertain, a ruling limiting the president's use of tariffs could significantly constrain executive power. If the administration loses, it might need to refund up to $90 billion already collected. However, the president could still enact tariffs under other, narrower laws.

The court's decision is expected within months, potentially impacting the scope of presidential authority in trade policy and the future of U.S. tariffs.