Former FBI Director James Comey threw the media, former Attorney General Loretta Lynch and President Donald Trump "under the bus" in his testimony, ex-GOP congressman and Trump supporter Peter Hoekstra told CNBC on Friday.

"But I think most importantly he threw James Comey under the bus," the former Michigan congressman said on "Squawk Box" on the morning after Comey's Senate testimony.

Comey went "after his own credibility, acknowledging that he was not strong enough to stand up against Loretta Lynch, the president and perhaps, more important, he took the issues that he had and rather than going to other places ... what he decided to do was to give those notes to a friend," he said.

In his nearly 2½-hour public testimony with the Senate Intelligence Committee, Comey described an interaction with Obama Attorney General Lynch during his agency's investigation into Hillary Clinton's emails. He said Lynch asked him to call the Clinton email probe "a matter" instead of an investigation.

The axed FBI director on several occasions also accused Trump of lying, and disputed an article written by The New York Times about contacts between Russian officials and Trump's advisors. The article drew attention to the alleged Russian attempt to manipulate the election.

Comey was likely trying to protect his reputation, said Graham Allison, a Harvard professor who served in the Defense Department under Presidents Ronald Reagan and Bill Clinton.

"I think in the backdrop of everybody's mind, including Comey's, is Watergate," Allison said on "Squawk Box." "I suspect he rehearsed more than once for his presentation. I thought he passed."