10
Nov
By Aaron C. Mandelbaum, David M. Schwartz, Samir D. Varma, Francesca M.S. Guerrero & Scott E. Diamond
On November 5, 2025, the U.S. Supreme Court heard oral arguments in a high-profile consolidated appeal challenging whether President Donald Trump lawfully invoked the International Emergency Economic Powers Act (“IEEPA”) to impose tariffs. The cases challenge two sets of tariffs Trump implemented earlier this year: (1) tariffs against Canada, China, and Mexico in response to alleged inaction on illegal fentanyl trafficking (see Update of February 3, 2025); and (2) sweeping “reciprocal” tariffs...