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Judge Andrew Napolitano said former FBI Director James Comey's comment that there's "certainly some evidence" that President Trump obstructed justice could be "dangerous" for the president.

Comey made the remark in an ABC interview that aired Sunday when he was asked about the investigation into Trump's former national security adviser Michael Flynn and Trump's alleged request that Comey "let it go."

“It would depend and — and I'm just a witness in this case, not the investigator or prosecutor, it would depend upon other things that reflected on his intent,” Comey said.

On "Fox & Friends" on Monday, Napolitano explained that most of the statements about Trump that Comey made in his new book and recent interviews are not significant because they're Comey's personal opinion.

"Why do I think that's dangerous? Because [Comey] talks to Mueller and because he knows Bob Mueller's thinking on this," Napolitano said. "We don't care if Jim Comey think the president may have obstructed justice, but if he's sending a signal that Mueller and company think that, they think it on the basis on some evidence. And that's potentially worrisome."

He said Comey is certainly talking to Mueller because he's a witness in the investigation.

"So they interact with each other all the time."

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