Former CIA Director John Brennan at a congressional hearing in 2017. President Trump revoked Brennan’s security clearance, claiming he was “erratic.” Brennan has been one of Trump’s harshest critics in the national security community.

Former CIA Director John Brennan at a congressional hearing in 2017. President Trump revoked Brennan’s security clearance, claiming he was “erratic.” Brennan has been one of Trump’s harshest critics in the national security community.