A Secret Service agent is under criminal and internal agency investigation for his alleged role in a hazing incident at a historically black fraternity at Miami’s Florida International University that landed a pledge in the hospital.

Sen. Marsha Blackburn sent a sharply worded letter Wednesday to Secret Service Director Sean Curran demanding an immediate, top-to-bottom review of the Secret Service, a move that comes nearly two weeks after an armed gunman sprinted past a checkpoint leading to the White House Correspondents’ Association dinner in a third assassination attempt on President Trump.

The head of the U.S. Secret Service is defending security arrangements at last Saturday’s White House Correspondents’ Association dinner, saying he would not change a thing about the security plan, even as questions continue to swirl around the shooting and his leadership of the agency.

For two weeks before an intruder broke through security at the White House Correspondents’ Association dinner in Washington, D.C., the Secret Service had been investigating a mystery shooting near the White House but had come up emptyhanded – to the frustration of both President Trump and top Department of Homeland Security officials – multiple Secret Service sources told RealClearPolitics.