"I think Bob Mueller is a decent and honorable man and I hope the American people will remember him from the days when he was in his prime," Kennedy told reporters.

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The former special counsel regularly asked lawmakers to repeat their questions and at times was reluctant to offer responses, sparking criticism of his performance.

CNN estimated that Mueller declined to answer questions more than 100 times during his Judiciary Committee testimony.

Kennedy added that he didn't think the House hearings were having the impact Democrats had hoped for.

"Number one, I don't think the hearings are producing the desired effect. Number two, I say that because I don't think this is exactly whipping the American people into a lather," he added. "Number three, so far for me it's just been one big anti-climax."

When a reporter tried to follow up with questions about Mueller's testimony, Kennedy added "that's all I've got" and walked away.

"Thus far Mueller completely contradicts what he told [Attorney General William] Barr about the reason not to proceed on the obstruction of justice," Graham tweeted during the Judiciary Committee hearing.