The meeting occurred before Nunes disclosed at a news conference last Wednesday that USA spy agencies may have inadvertently captured Trump and his associates in routine targeting of foreigners' communications.
"Because of classification rules, the source could not simply put the documents in a backpack and walk them over to the House Intelligence Committee space", Nunes' spokesman, Jack Langer, said on Monday.
Mr Nunes has been concerned that Trump associates were captured in "incidental" United States surveillance of foreign targets even before Mr Trump made his baseless claims that former president Barack Obama had wiretapped him past year. He said he didn't believe the President nor any of his West Wing team were aware he was there, and the White House said Monday it learned of Nunes' visit through media reports and directed any questions to the congressman.
Late last week, Nunes publically apologized for not first huddling with his fellow Intelligence Committee members to go over the materials before he delivered them to the President.
Jared Kushner, Trump's son-in-law and a top White House adviser, has volunteered to testify to a Senate committee probing whether Russian Federation tried to interfere in the 2016 presidential election, the White House says. CNN is now reporting that Nunes had in fact slipped off to the White House grounds last Tuesday to view the documents.
CNN has reported, meanwhile, that Nunes was seen on the night in question at the National Security Council offices in the Eisenhower Executive Office Building, which is next to the White House and encompasses what the official White House site describes as "a majority of offices for White House staff".
Nunes, Schiff and FBI Director James Comey all have said there is no evidence that Trump Tower was wiretapped by President Barack Obama, as Trump has asserted.
The California Republican confirmed to CNN in a phone interview Monday he was on the White House grounds that day - but he said he was not in the White House itself. He told me that when he finally saw the documents last Tuesday evening, he made sure to copy down their identifying numbers so he could request access to them formally for the rest of the committee.
The chairman privately apologized to the committee for his actions Thursday, but Monday's revelation that he secretly viewed the information at the White House before briefing Trump was prompting fresh calls for an independent commission to replace the House panel in its Russian Federation probe.
The Democrats have long had a troubling relationship with the work of the government's national security and intelligence agencies so it is worth reviewing some history and looking at who among the House Democrats are on HPSCI.
Rep. Nunes did have a source for his claims, but his source was someone from the intelligence community.
"My complaint with the chairman is taking whatever information he has to the White House, when the White House is the subject in a way of the investigation", he said Sunday on CBS's "Face the Nation".
"To protect his source, the chairman has repeatedly said he will not reveal any information at all about the source, " Langer said.