Dan Bongino, the radio and podcast host tapped by President Trump to serve as deputy FBI director, has ripped Republican Sens. Bill Cassidy (La.) and Lisa Murkowski (Alaska) in the past, attacks that will draw more attention to his controversial nomination.

The appointment of Bongino, a former Secret Service agent and NYPD officer turned conservative radio host, puts a second Trump ally at the top of the agency.

Dan Bongino has been chosen as the FBI's second-in-command, a job that doesn't need Senate confirmation. Here's what to know about the Secret Service agent-turned-conservative media personality.