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"Fox News Sunday" host Chris Wallace said it's "not crazy" for President Donald Trump to be concerned about bias in the FBI.

On "Shepard Smith Reporting," Wallace pointed out that Peter Strzok, the former FBI counterintelligence agent who was removed from Special Counsel Robert Mueller's team after his anti-Trump texts were discovered, played a significant role in both Mueller's Russia investigation and the Hillary Clinton email inquiry.

Wallace said it's "troubling" that Strzok was exchanging anti-Trump, pro-Clinton texts with another FBI agent, and also that former FBI Director James Comey’s draft statement on the Clinton email investigation was heavily edited in ways that seemed to significantly water down the bureau's findings.

“It’s not crazy for President Trump to be concerned by the bias that's being shown by some members of the FBI at the top levels,” Wallace said.

“There's an old saying: Even hypochondriacs get sick,” Wallace said. "Even if you're suspicious about people, it may well be that there was some bias there."

He said it remained to be seen if Mueller's investigation was affected by some investigators' apparent biases, but it is reassuring that Mueller removed Strzok when his texts were discovered.

"But what was Peter Strzok doing there in the first place?" Wallace said. "Somebody who's so incredibly biased, why didn't they find out about that earlier?"

Watch more above.

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