The Trump administration has refunded approximately $100bn in tariffs to US importers after the US Supreme Court struck down a large portion of the president's tariff regime in a 6-3 ruling in February. The court found that Trump had exceeded his authority by invoking the 1977 International Emergency Economic Powers Act (IEEPA) — a law allowing the president to regulate commerce during a national emergency — to impose fentanyl-related tariffs on Canada, Mexico and China, as well as broader "reciprocal" tariffs on more than 90 countries. The refunds, disclosed in a court filing by US Customs and Border Protection, cover more than three-quarters of $128.68bn earmarked for return, though Trump has continued issuing new tariffs since the ruling, prompting a fresh legal challenge from 25 US states who argue the new levies are a pretext to reinstate those struck down.