Devin Nunes
© Jonathan Ernst / ReutersU.S. House Permanent Select Committee on Intelligence Chairman Representative Devin Nunes (R-CA)
Democrats are calling for the House Intelligence Committee chair to step down after he confirmed meeting with a source on the grounds of the White House before announcing new evidence of "incidental" surveillance on the Trump transition team.

On Wednesday, House Intelligence Committee Chairman Devin Nunes (R-California) announced that the intelligence community "incidentally" intercepted information on President Donald Trump's transition team.

Nunes is leading the House panel's investigation into whether there was Russian interference in the 2016 election, and by extension, any possible collusion with the Trump team during that time.

On Monday, Nunes told CNN that he had gone to the White House grounds to meet with an unnamed source and review reports. However, Nunes says he was not in the White House itself.

Jack Langer, a spokesman for Nunes, says he went onto the grounds because he needed a secure location where he could access the reports, which are only distributed within the executive branch.

"Chairman Nunes met with his source at the White House grounds in order to have proximity to a secure location where he could view the information provided by the source," Langer said Monday, according to the Associated Press.

Nunes told Bloomberg on Monday that he went to the White House because he didn't "have networked access to these kinds of reports in Congress."

Upon finding the documents, Nunes said he copied their identifying numbers so he could formally request them for the rest of his committee to view. Nunes says other members of his committee would be able to read the documents as soon as this week.

He has not named his source and did not indicate that it was from the White House itself.

"We don't talk about sources at this committee. We want more people to come forward," Nunes said, according to the Wall Street Journal.

At a press briefing Monday, reporters asked White House Press Secretary Sean Spicer if Nunes' source could have come from the White House itself. Spicer said he did not know anything about the meeting beyond what Nunes has said publically.

"I'm not going to get into who he met with or why he met with them. I think that's something that he had made very clear, and I'll let him answer it," Spicer said.

Democrats have criticized Nunes, who served on Trump's transition team's executive committee, for his connection to the White House during the investigation. On Monday, several Democrats, including Senate Majority Leader Chuck Schumer of New York, called for Nunes to step down as the head of the House Intelligence Committee.

"Chairman Nunes is falling down on the job and seems to be more interested in protecting the president than in seeking the truth. You cannot have the person in charge of an impartial investigation be partial to one side. It's an inherent contradiction," Schumer said, according to The Hill.

Schumer called for House Speaker Paul Ryan (R-Wisconsin) to replace Nunes on the committee in order to have "a credible investigation."

Congressman Adam Schiff (D-California), a ranking member of the House Intelligence Committee, also released a statement Monday calling for Nunes to recuse himself from the investigation.

"I believe that the Chairman should recuse himself from any further involvement in the Russia investigation, as well as any involvement in oversight of matters pertaining to any incidental collection of the Trump transition, as he was also a key member of the transition team," Schiff said.

"This is not a recommendation I make lightly, as the Chairman and I have worked together well for several years," he continued.

Other members of the House Intelligence Committee have also called for Nunes to recuse himself from the investigation.