The near-assassination of former President Donald Trump is the Secret Service’s most stunning failure in decades. That’s the opinion of her boss, Homeland Secretary Alejandro Mayorkas. “When I say that something like this cannot happen, we are speaking of a failure,” he said Monday on CNN; on ABC, it was: “A direct line of sight like that to the former president should not occur.” The total security breakdown at Trump’s Butler, Pa., rally — which came an inch from killing the ex-prez, and did take Corey Comperatore’s life with two other civilians put in critical condition — is on her,...