Despite the bluster from Trump, who once promised that he would stop wars, the president’s grip on his base is being called into question after he started one on Saturday. His decision to partner with Israel to pursue regime change in Iran has, over the past 48 hours, sparked broad pushback from some high-profile supporters who have often fallen into line previously, as well as from adoptees of Trump’s “America First” philosophy, who are now criticizing the strikes and wondering how they align with his promises to put the United States and its interests ahead of everything else.