“This is an introduction of U.S. forces into hostilities. It absolutely triggers the 48-hour notice requirement.” People watch from a rooftop as a plume of smoke rises after a strike in Tehran, Iran, on March 1, 2026. Photo: Vahid Salemi/AP President Donald Trump’s order to launch a coordinated U.S.-Israeli strike against Iran ran afoul of international and domestic law, according to military and legal experts including the former legal chief at U.S. Central Command, which c