Two congressional sources says the three subpoenas for the unmasking investigation are for the FBI, CIA, and NSA in order to obtain information on unmasking requests made by former United Nations ambassador Samantha Power, former national security adviser Susan Rice and former CIA director John Brennan. He then told journalists and White House officials that Trump or his closest associates may have been "incidentally" swept up in foreign surveillance by American spy agencies.
Cohen's ties with Russian interests came up in February when The New York Times reported that Cohen helped to broker a Ukraine peace plan that would call for the withdrawal of Russian troops from Ukraine and a referendum to let Ukrainians decide whether the part of the country seized by Russia in 2014 should be leased to Moscow. Flynn plans to produce some of the documents by next week, said the person, who spoke on condition of anonymity to discuss Flynn's private interactions with the committee.
FILE - In this December 16, 2016, file photo, Michael Cohen, an attorney for Donald Trump, arrives in Trump Tower in NY.
A Nunes spokesman did not return multiple requests for comment sent Wednesday evening and Thursday morning.
A political feud erupted on Wednesday over the U.S. House Intelligence Committee's probe of suspected Russian meddling in the 2016 presidential election, with charges that the panel's Republican chairman subpoenaed the CIA, FBI and National Security Agency without telling Democratic members.
Rep. Jason Chaffetz, Republican chairman of the House Oversight and Government Reform Committee, has asked the Department of Justice inspector general to look into Comey's firing.
Congress is now out of session. "He blows away their case against him & now wants to clear his name by showing 'the false or misleading testimony by James Comey, John Brennan.' Witch Hunt!"More news: Putin asks US businessmen to help restore normal dialogue with Washington
More news: Putin denies Russian meddling in US election
More news: Justice Department Turns to High Court to Reinstate Travel Ban
"I found a treasure trove of stuff that's really bad in terms of surveillance on Americans and that is critical to the job that I have as chairman of the House Intelligence Committee", Nunes said. Richard Burr, R-N.C., said the committee welcomes Comey's testimony, but declined to comment further.
Subpoenas were approved Wednesday for Flynn and his company, Flynn Intel Group, and Cohen and his firm, Michael D. Cohen & Associates.
Nunes drew intense scrutiny after it emerged that he met with a secret source on the White House grounds the day before he briefed the president on information that showed Trump and his advisers may have had their communications "incidentally collected" by the intelligence community during the transition period.
Cohen, who'd earlier refused a request for information saying it was "not capable of being answered", told The Associated Press on Tuesday that he would comply with subpoenas, should they be issued.
However, Cohen said Tuesday that he would gladly testify if subpoenaed because he has "nothing to hide".
Trump, a Republican, has denied any collusion between Russian Federation and his campaign and has repeatedly questioned the USA intelligence finding that Putin led an operation that included computer hacking, fake news and propaganda meant to swing the election in his favour. And Nunes was visibly absent from the House's second public hearing on Russian Federation, which featured former CIA Director John Brennan. Also, the US Department of Justice recently appointed a special counsel.
The longtime Justice official previously served as Federal Bureau of Investigation general counsel under Mueller. He later joined and ran the Enron Task Force.