Brendan Smialowski / AFP | Former FBI director James Comey is sworn in during a hearing before the Senate Select Committee on Intelligence on Capitol Hill June 8, 2017 in Washington, DC.

US President Donald Trump denied on Friday that he had asked ex-FBI chief James Comey to ‘let go’ an investigation into a former national security adviser, adding he was willing to give his version of events under oath.

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"I didn't say that," Trump told reporters when asked about Comey's account relating to the investigation into former national security adviser Michael Flynn. Comey, fired by Trump last month as FBI head, gave the account in sworn testimony to a Senate panel on Thursday.

Asked if he would be willing to give his version of events under oath, Trump replied: "100 percent."

Earlier Friday morning Trump claimed "total and complete vindication," when he broke his Twitter silence to weigh in on fired FBI Director James Comey's closely watched testimony, suggesting Comey, who was under oath at the hearing, had committed perjury.

Trump had refrained from tweeting all day Thursday even as Comey accused his administration of spreading "lies" and suggested Trump had attempted to influence the investigation into Russian interference in the 2016 election.

Despite so many false statements and lies, total and complete vindication...and WOW, Comey is a leaker! — Donald J. Trump (@realDonaldTrump) June 9, 2017

Trump also seized on Comey's revelation that he had directed a friend to release memos he'd written documenting his conversations with the president to a reporter.

"...and WOW, Comey is a leaker!" Trump wrote at 6:10am.

Trump also retweeted a comment from attorney Alan Dershowitz, who had written: "We should stop talking about obstruction of justice. No plausible case. We must distinguish crimes from pol (sic) sins."

<< Read more: Comey took Trump request on Flynn probe as a 'direction' >>

Trump had stayed unusually quiet on Thursday, refraining from weighing in on the testimony gripping the country both on Twitter and at several public appearances. Instead, Trump let his lawyer do the talking for him.

In his first congressional appearance since being abruptly fired by Trump last month, Comey detailed months of distrust of the president and bluntly asserted that Trump had fired him to interfere with the probe of Russia's ties to the Trump campaign.

He said that he'd carefully documented his interactions with Trump because he worried Trump would misrepresent them, and accused the administration of spreading "lies, plain and simple" about the reasons for his firing.

Comey's testimony underscored the discord that had soured their relationship. He painted Trump as a chief executive dismissive of the FBI's independence and made clear that he interpreted Trump's request to end an investigation into the former national security adviser as an order coming from the president.

Comey also revealed that he'd orchestrated the public release of information about his private conversations with the president in an effort to further the investigation.

Trump's private attorney, Marc Kasowitz, seized on the admission, casting the former FBI director as one of the "leakers" set on undermining the Trump administration.

The attorney is expected to file a complaint with the Justice Department inspector general about the revelation next week, according to a person close to the legal team who agreed to speak ahead of the filing on condition that the person's name is not used.

Kasowitz also maintained that the testimony made clear that Trump "never, in form or substance, directed or suggested that Mr. Comey stop investigating anyone".

While Trump's staunchest supporters have tried to paint Comey's testimony as vindication for the president, few Republicans who don't work for Trump stepped in to defend the president's version of his contacts with Comey.

Sen. Susan Collins, a moderate Republican, said Congress needs to obtain any tapes the president might have of his dealings with the former FBI director. She called Comey an "honorable individual".

"I found him to be credible, candid and thorough," Collins said of Comey on MSNBC's "Morning Joe."

Collins, a member of the Senate intelligence committee, which is investigating Russia's interference in the 2016 election, said Comey's motivation "may have been a good one". But, she said, he was wrong to leak his notes to the public and should have given that document to her panel.

(FRANCE 24 with AP, REUTERS)

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