"Yesterday showed no collusion, no obstruction".
He said he began writing memos after his meetings with Mr Trump because he was "honestly anxious he might lie". At the same time, the head of the panel said its investigation is just getting started, and a second committee may summon Comey to testify. He said he leaked some of those notes last month, hoping to prompt the naming of a special counsel.
Mr Comey had detailed this interaction in a memo, writing that the President told him: "I hope you can see your way clear to letting this go, to letting Flynn go".
House and Senate investigators have now fired off requests for both Mr Comey's memos and any recordings the White House kept of his private meetings with President Trump.
Comey also said he took steps to ensure he wrote the memos in a way that it would not be necessary to label them as classified.
Earlier Friday, Trump said via Twitter that Comey's testimony Thursday before the Senate Committee on Intelligence supported his statements. "I'm not hinting anything". And for this guy as a politician to then go back and write a memo: "'Oh, I felt threatened.' He felt so threatened - but he didn't do anything". And if you could also tell us, sir, do tapes exist of your conversations with him?
This proves for the 8,457 time why Trump doesn't need to be on Twitter.
"Are their tapes, sir?" "I'm not going to say, 'I want you to pledge allegiance.' Who would do that?"
Comey said he believed Trump's statement meant the president had directed him to drop an FBI investigation into Flynn's alleged ties to Russian Federation.
SEN. SUSAN COLLINS, R-Maine: I found him to be credible, candid and thorough.
After, it seemed like the president might have been confused about the question.
"Theres no question he abused power", Ms Pelosi said.
The President later said he would "100%" be willing to testify under oath.
"I would be glad to tell him exactly what I just told you, Jon", Trump responded.
The president's lawyers plan to file a complaint with the justice department inspector general next week arguing that Mr Comey should not have shared what they call privileged communications, according to two people involved in the matter.
"I think he's proven himself to be a liar in all of this".
He also retweeted a comment from attorney Alan Dershowitz, who had written: "We should stop talking about obstruction of justice". "Whether he obstructed justice, remains for the facts to come forward, and that's what we want are the facts".
One of the things Comey told the Senate committee was that he believes he was sacked last month in an effort to "relieve" pressure on Trump from the Justice Department investigation.