 That's what it sounded like when the head of the Secret Service was chased down by two senators at the convention last night, demanding answers into the assassination attempt on Trump. Republican Senators Marsha Blackburn and John Barrasso accused U.S. Secret Service Director Kimberly Cheadle of stonewalling them as she refused to respond to their repeated jeers. Video of the encounter was posted to Senator Blackburn's social media.