It is very unusual for a committee chairman and ranking member not to coordinate meetings related to an investigation.
But Nunes canceled all hearings planned for this week on Friday, before the White House's response period had expired.
Mr Nunes said his first visit to the White House was not to see Mr Trump but attend meetings "to confirm what I already knew" and claimed no one from the Trump team knew he was there.
Yates in January warned the White House that Flynn could be vulnerable to blackmail after he made incorrect statements about his contacts with Sergey Kislyak, the Russian ambassador to the United States. Not only that but the Russians' knowledge about what Flynn had said left him open to blackmail, the Federal Bureau of Investigation warned.
To which Schiff responds: So why didn't someone bring the evidence to the House Intelligence Committee, rather than leak it to Nunes, who then briefed Trump - bypassing the committee that Nunes chairs?
In an interview on CBS' "This Morning", Ryan says Nunes told him a "whistleblower-type person" gave him some new information on Russian meddling in the election.
But Rep. Jackie Speier, D-Calif., a member of the committee, said Tuesday that Nunes should step down "in the interest of our integrity". Some of Nunes' fellow Republicans have questioned his objectivity after he made a controversial announcement last week about USA spy agency surveillance.
As chairman of the House Intelligence Committee, Rep. Devin Nunes is responsible for looking into the Trump team's alleged ties to Russian Federation during the 2016 presidential election campaign.More news: Coaches: Carolina Final Four advantage to fade after tipoff
"I don't know who his source is", Schiff said.
He faces criticism for not telling Schiff about the White House visit. And other Republicans are standing by the chairman.
"I think we have a different dynamic over here in the House", Rep. Burr's been in the Senate since 2005, and served in the House since 1995.
So the House Intelligence Committee saga rolls on, at least in name only.
Republicans on the committee publicly continued to back him. He needs to demonstrate that he's the chairman of a bipartisan oversight panel trusted with the nation's secrets, rather than a conduit for information from the Trump White House.
In a letter to O'Neil, Associate Deputy Attorney General Scott Schools says the potential testimony described by the attorney involved conversations Yates and another senior department official had with the office of the counsel to the president, and that "such communications are likely covered by the presidential communications privilege and possible the deliberative process privilege".
White House spokesman Sean Spicer disputes the Post report.
Spicer on Tuesday said the White House never sought to stop her. He highlighted numerous incidents in the past month in which there was coordination between the White House and Nunes, including on the issue of incidental collection of communications.
Perhaps that was Nunes's intention - and Trump's. He declined to share the documents with his fellow committee members - even Republicans - and it later emerged he didn't even have them in his possession. It should be pursued by a special prosecutor and there should be a public commission.