Comey said he told Trump in multiple conversations that he was not being personally investigated and said the president implored him to make that public. Would you be willing to speak under oath to give your version of those events?
"I do think he is unquestionably, if this thing goes anywhere, one of the star witnesses", said Robert Anderson, a retired Federal Bureau of Investigation executive assistant director.
Mr Comey, who was sacked by Mr Trump in May, delivered a scathing indictment of the president on Thursday at a congressional hearing in which he accused Mr Trump of trying to block the investigation into Mr Flynn. And there would be nothing wrong if I did say that according to everybody that I've read today.
US President Donald Trump on Sunday accused James Comey of cowardice by leaking accounts of his meetings with the president, days after the ex-FBI director testified that Trump sought to derail the Russian probe.
Trump lashed out at Comey, dubbing him a "leaker" for indirectly providing reporters with the contents of his memos summarising their private conversations in the weeks before he was sacked.
Comey, on the other hand, said during his Senate Intel Comittee testimony "Lordy, I hope there are tapes", so there seems to be some confusion between the two men over who would benefit from audio of their talks leaking.
"The American people deserve to hear directly from this president, under oath, about his charges with respect to Mr. Comey", said Sen Jack Reed, D-R.I.
Trump also took a question about the United States' commitment to NATO, saying the U.S.is committed to Article 5, the NATO policy of "collective defense" - meaning, if one NATO country is attacked, it is considered an attack against all.
Iohannis spoke of Trump's remarks last month about some members of North Atlantic Treaty Organisation not spending enough of defense, saying he liked the US president's speech on the matter.
Through his personal attorney, Trump has effectively denied that he ordered Comey to drop the criminal probe against Flynn.
He said he would be happy to speak to special counsel Robert Mueller, who is investigating allegations that Russian Federation interfered with the election and colluded with Trump's campaign.
"Well, I didn't say that".
"The president is new to this", he told reporters.
Trump tweet: "Despite so many false statements and lies, total and complete vindication".
Trump: I didn't say that.
TRUMP: I would be glad to tell him exactly what I just told you, Jon.
Harvard Law School professor Mark Tushnet said onlookers should keep in mind that Comey knows much more than he can say, calling his testimony a "big deal".
Republicans, pleased some seven months ago but who support Trump, may concur with the president's assessment of Comey as a "showboat".
Trump: Over a very short period of time. "He's a leaker", Trump said. House Speaker Paul Ryan, R-Wis., offered some bad news on this score immediately after the long-awaited appearance of former FBI Director James Comey before a Senate Committee last week.