In a compelling column, George Will – who knows a thing or two about conservatism – makes the conservative case against Donald Trump. Mr. Will refers to Trump as an “unprecedentedly and incorrigibly vulgar presidential candidate” who is coarsening our civic life. He labels Trump “a counterfeit Republican and no conservative.” And he argues that Trump is an affront to anyone devoted to the legacy of William F. Buckley, Jr., the founder of National Review and a giant in American conservatism. Just as Buckley excommunicated the John Birch Society from the conservative movement in the 1960s, so should conservatives today...