Bill Hemmer and Fox News contributor Marie Harf debated this morning the Democrats' calls for House Intelligence Committee chairman Devin Nunes (R-CA) to step aside from the Russia investigation. 

Harf, a former State Department spokesperson, criticized Nunes for failing to share information with other committee members, instead meeting on White House grounds with a secret source behind his claim that President Trump's associates were caught up in "incidental" surveillance.

Nunes has since said it's routine for committee members to go to White House grounds to view classified information if the documents cannot be brought to Capitol Hill. 

Harf said there is a secure room for viewing classified information on House grounds. 

"That's what he said. Unless you're calling him a liar..." Hemmer responded. 

Harf said she was not calling Nunes a liar, but argued that he has provided "zero evidence beyond his statements" about surveillance of the Trump team. 

She also pointed out that Sen. John McCain (R-AZ) said this morning that he's "never heard of any such thing," referring to Nunes' briefing of the White House about the information.

In an interview on "The O'Reilly Factor," Nunes denied he'd done anything improper and dismissed the Democrats' calls for his recusal from the probe.

"I’m sure the Democrats do want me to quit, because they know that I’m quite effective at getting to the bottom of things," said Nunes.

Watch the compelling exchange above. 

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