Secret Service had one job: A week and a half ago, an assassin attempted to shoot former President Donald Trump at a campaign rally in Butler, Pennsylvania, and missed his head by a few millimeters, grazing his ear. Yesterday, Secret Service Director Kimberly Cheatle appeared before the House Committee on Oversight and Accountability to answer for the agency’s shocking ineptitude. “The director declined to answer questions about how the security perimeter was drawn for the rally, whether law enforcement swept the roof in advance or how many agents were assigned to the event, saying a review of…