US President Donald Trump on Friday issued a stern warning saying he hoped there were no "tapes" of their conversations.
The White House has given various accounts and explanations for Comey's firing.
"I said, 'If it's possible, would you let me know, am I under investigation?' He said you are not under investigation", Trump said in an interview Thursday with NBC News. "Career prosecutors and investigators know that public trust matters, and consequently they zealously safeguard not only their actual independence, but also the appearance of independence".
McCabe's testimony undercut a White House narrative that has evolved in the two days since Comey was ousted.
Trump then went on to suggest scrapping the traditional White House briefings that have existed in some form since the Woodrow Wilson administration nearly a century ago.
She also discusses the protocol for proper communication with the White House and explains the attention given to the rules to ensure there is no inappropriate communication between the White House and the Department of Justice.
The former intelligence chief also dismissed Trump's assertion that the Russian Federation investigation is "fake news", and indirectly issued some advice to the White House to cooperate with the inquiry.
An unnamed former senior FBI official told NBC News that Comey would never have said such a thing to the President, as it is a breach of protocol to comment on ongoing investigations. I won't talk about that.
U.S. President Donald Trump said Saturday that a new Federal Bureau of Investigation director could be named in the next week.
Those Democrats, Reps. Elijah Cummings of Maryland and John Conyers of MI, also requested "all documents, memoranda, analyses, emails, and other communications relating to the President's decision to dismiss Director Comey - a decision which the president declared yesterday he planned to make "regardless of [Deputy Attorney General Rod Rosenstein's] recommendation" - and all discussions with Director Comey".
USA intelligence agencies concluded in January that Russian President Vladimir Putin ordered a campaign of interference in the election aimed at tilting the vote in Trump's favor.
Later, Spicer was asked by another reporter if Trump had a tape of his conversation with Comey in late January.
The firing of Comey already has left Trump with the dubious distinction of being the first president since Nixon to dismiss a law enforcement official overseeing an investigation tied to the White House. "I would find that very inconsistent with what I know of Jim Comey", Clapper told MSNBC, adding it would have been "out of character for him to ask to stay on".
The White House initially cited a Justice Department memo criticizing Comey's handling of last year's investigation into Hillary Clinton's emails as the impetus for Trump's decision. But he called Trump's tweet "inappropriate". John Cornyn of Texas, the No. 2 Senate leader and a former state attorney general.
Almost a dozen people are being considered, including attorneys, law enforcement officials and legislators.