"The Justice Department is mandated to do an investigation, but I've got to tell you my personal opinion," Kerik said on Newsmax. "This Justice Department, [Attorney General] Merrick Garland and the director of the FBI [Christopher Wray] are extremely biased against President Trump. That's pretty obvious."

Kerik said an "independent commission that oversees an investigation into the attempted assassination" should be established.

"I think somebody has to take a look, a serious look at Secret Service," he said.