The top Democrat on the Senate Intelligence Committee is raising questions about House Intelligence Chairman Devin Nunes (R-Calif.) after reports emerged that he was on White House grounds a day before his announcement related to surveillance of President Trump's transition team.

Sen. Mark Warner Mark Robert WarnerIntelligence chief says Congress will get some in-person election security briefings Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House approves bill to secure internet-connected federal devices against cyber threats MORE (D-Va.) said it was "more than suspicious" that Nunes made the trip to White House grounds, according to Politico.

“Who is he meeting with?” Warner said.

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“Was it a source or was it somebody from the administration? And then he goes through this, what appears to be a charade, where he comes out the next day and briefs the president before he tells the Democrats.”

Nunes shocked much of Washington last week when he told reporters that he had seen evidence that intelligence agencies during the Obama administration incidentally collected information on members of the Trump team during routine surveillance. He also said this information had been widely disseminated in intelligence circles and that private U.S. citizens had been "unmasked" in the reports.

The chairman then went to the White House to brief the president on his findings, leaving fellow committee members out of the loop.

Nunes said Monday he was on White House grounds the day before the announcement, but not in the White House itself, for meetings "to confirm what I already knew."

A spokesperson for Nunes said the congressman "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."

The White House directed questions about the episode to Nunes.