Iranians hold their guns during a pro-government gathering near the residence where former Iranian Supreme Leader Ayatollah Ali Khamenei was killed. AP Photo/Vahid Salemi The coordinated U.S.-Israeli strikes at the outset of the war in Iran killed Supreme Leader Ali Khamenei, along with other key regime figures. In doing so, the United States and Israel crossed what The New York Times and others described as “a new Rubicon”: the deliberate, overt killing of a head of state. President Donald T