This Planet Money episode explores the legal challenges to President Trump's tariffs, focusing on a lawsuit filed by Susan Weber of the Blackfeet Nation. The podcast examines the constitutional basis for tariffs, traditionally a Congressional responsibility, and how Trump has utilized the International Emergency Economic Powers Act (IEPA) to impose tariffs, a move considered unprecedented. The episode further explains the arguments against Trump's use of IEPA, including whether a national emergency truly exists and whether the act was intended for tariffs, and it delves into the constitutional question of whether Congress can delegate such broad tariff power to the President. The episode concludes by noting that while lower courts have ruled against the administration, the issue is likely to be decided by the Supreme Court.