Adam Schiff, the ranking Democrat on the House Intelligence Committee, said Nunes should step down from the investigation.
Virginia Sen. Mark Warner, the top Democrat on the Senate intelligence committee, said that White House meddling is not helping to "remove the cloud that increasingly is getting darker over the administration". "Oh, that's ridiculous", Chaffetz said, adding, "Come on that's a silly reason".
The report claims her testimony might contradict White House statements.
"I can not get into who those individuals were", Spicer said at the daily news briefing. He told reporters last week that he had seen troubling information about the improper distribution of Trump associates' intercepted communications, and he briefed the president on the material, all before informing his Democratic counterpart on the House committee.
Rep. Peter King (R-Seaford), a member of the Intelligence Committee, said he supports Nunes and defended his trip to the White House grounds and conveyance of the information to Trump.
The Senate intelligence committee has asked 20 people to be questioned in its investigation of Russian interference in the 2016 presidential election, the panel's chairman said Wednesday.
Nunes, R-Calif., has been the subject of growing scrutiny over the past week since he announced that members of President Donald Trump's transition team were incidentally caught up in surveillance by the USA intelligence community in November, December and January.
Top aide to President Donald Trump leaves administration
The official said Walsh saw a need to better organize support for the White House's initiatives on the outside. Before serving as chief of staff at the RNC, Walsh worked on a number of political campaigns, including Sen.
Ryan spokeswoman Ash Lee Strong said in an email that "speaker Ryan has full confidence that chairman Nunes is conducting a thorough, fair, and credible investigation". Yates was the deputy attorney general in the final years of the Obama administration and served as the acting attorney general in the first days of the Trump administration.
Democrats and some prominent Republicans have criticised Nunes, a Trump ally, since he announced last week that U.S. security agencies had collected information on Trump's transition team while conducting legal surveillance on other targets.
"You've got to know when to walk away from a deal that is going to end up bad", he continued.
Meanwhile, the Washington Post reported Tuesday that the Trump administration last week had attempted to block Yates from testifying, citing letters between her lawyer and Justice Department officials, a claim White House spokesman Sean Spicer called "100 percent false".
"Until Mr. Comey comes in, it's a little tough for us to do depositions and interviews", Nunes said.
The Senate Intelligence Committee, which is also investigating Russia's role in the election, wants to question Trump's son-in-law and adviser, Jared Kushner, about meetings he held with the Russian ambassador and a Russian banker in December.
Meanwhile, the Senate Intelligence Committee, which is conducting its own probe into the Russian meddling in last year's US election, will meet in a closed session and its two leaders, Sen.