Former FBI Director James Comey asserted Thursday that President Donald Trump fired him to interfere with his investigation of Russia鈥檚 role in the 2016 election and its ties to the Trump campaign.

鈥淚t鈥檚 my judgment that I was fired because of the Russia investigation,鈥� Comey told the Senate intelligence committee in explosive testimony that threatened to undermine Trump鈥檚 presidency.

鈥淚 was fired in some way to change, or the endeavour was to change, the way the Russia investigation was being conducted,鈥� Comey testified under oath.

鈥淭hat is a very big deal, and not just because it involves me.鈥�

Comey also accused the Trump administration of spreading 鈥渓ies, plain and simple鈥� about him and the FBI in the aftermath of his abrupt firing last month, declaring that the administration then 鈥渃hose to defame me and, more importantly, the FBI鈥� by claiming the bureau was in disorder under his leadership.

BREAKING: Trump lawyer accuses Comey of `unauthorized disclosures' of `privileged communications' he had with the president.

鈥� The Associated Press (@AP)

And in testimony that exposed deep distrust between the president and the veteran lawman, Comey described intense discomfort about their one-on-one conversations, saying he decided he immediately needed to document the discussions in memos.

鈥淚 was honestly concerned that he might lie about the nature of our meeting, so I thought it really important to document,鈥� Comey said. 鈥淚 knew there might come a day when I might need a record of what happened not only to defend myself but to protect the FBI.鈥�

The revelations came as Comey delivered his much anticipated first public telling of his relationship with Trump, speaking at a packed Senate intelligence committee hearing that brought Washington and parts of the country to a standstill as all eyes were glued to screens showing the testimony.

The former director immediately dove into the heart of the fraught political controversy around his firing and whether Trump interfered in the bureau鈥檚 Russia investigation, as he elaborated on written testimony delivered Wednesday.

In that testimony he had already disclosed that Trump demanded his 鈥渓oyalty鈥� and directly pushed him to 鈥渓ift the cloud鈥� of investigation by declaring publicly the president was not the target of the FBI probe into his campaign鈥檚 Russia ties.

Comey said that he declined to do so in large part because of the 鈥渄uty to correct鈥� that would be created if that situation changed.

Comey also said in his written testimony that Trump, in a strange private encounter near the grandfather clock in the Oval Office, pushed him to end his investigation into former National Security Adviser Michael Flynn.

Democratic Sen. Joe Manchin of West Virginia asked Comey the key question: 鈥淒o you believe this rises to obstruction of justice?鈥�

鈥淚 don鈥檛 know. That鈥檚 Bob Mueller鈥檚 job to sort that out,鈥� Comey responded, referring to the newly appointed special counsel who has taken over the Justice Department鈥檚 Russia investigation.

In a startling disclosure, Comey revealed that after his firing he actually tried to spur the special counsel鈥檚 appointment by giving one of his memos about Trump to a friend of his to release to the press.

鈥淢y judgment was I need to get that out into the public square,鈥� Comey said.

Trump鈥檚 private attorney, Marc Kasowitz, seized on Comey鈥檚 affirmation that he told Trump he was not personally under investigation.

Though Comey said he interpreted Trump鈥檚 comments as a directive to shut down the Flynn investigation, Kasowitz also maintained in his written statement that Comey鈥檚 testimony showed that the president 鈥渘ever, in form or substance, directed or suggested that Mr. Comey stop investigating anyone, including suggesting that that Mr. Comey 鈥榣et Flynn go.鈥欌��

The Republican National Committee and other White House allies worked feverishly to lessen any damage from the hearing, trying to undermine Comey鈥檚 credibility by issuing press releases and even ads pointing to a past instance where the FBI had had to clean up the director鈥檚 testimony to Congress.

Republicans and Trump鈥檚 own lawyer seized on Comey鈥檚 confirmation, in his written testimony, of Trump鈥檚 claim that Comey had told him three times the president was not directly under investigation.

Trump himself was expected to dispute Comey鈥檚 claims that the president demanded loyalty and asked the FBI director to drop the investigation into Flynn, according to a person close to the president鈥檚 legal team who demanded anonymity because of not being authorized to discuss legal strategy.

The president has not yet publicly denied the specifics of Comey鈥檚 accounts but has broadly challenged his credibility, tweeting last month Comey 鈥渂etter hope there are no 鈥榯apes鈥欌�� of the conversations.

鈥淟ordy, I hope there are tapes,鈥� Comey remarked at one point Thursday, suggesting such evidence would back up his account over any claims from the president.

Democratic Sen. Dianne Feinstein of California asked the question that many Republicans have raised in the weeks since Comey鈥檚 firing as one media leak followed another revealing Comey鈥檚 claims about Trump鈥檚 inappropriate interactions with him.

Discussing the Oval Office meeting where Comey says Trump asked him to back off Flynn, Feinstein asked: 鈥淲hy didn鈥檛 you stop and say, 鈥楳r. President, this is wrong,鈥�?鈥�

鈥淭hat鈥檚 a great question,鈥� Comey said. 鈥淢aybe if I were stronger I would have. I was so stunned by the conversation I just took it in.鈥�

The hearing unfolded amid intense political interest, and within a remarkable political context as Comey delivered detrimental testimony about the president who fired him, a president who won election only after Comey damaged his opponent, Hillary Clinton, in the final days of the campaign.

Clinton has blamed her defeat on Comey鈥檚 Oct. 28 announcement that he was re-opening the investigation of her email practices. 鈥淚f the election were on Oct. 27, I would be your president,鈥� Clinton said last month.

Thursday鈥檚 hearing included discussion of that email investigation, as Comey disclosed that then-Attorney General Loretta Lynch instructed him to refer to the issue as a 鈥渕atter,鈥� not an 鈥渋nvestigation.鈥�

鈥淭hat concerned me because that language tracked how the campaign was talking about the FBI鈥檚 work and that鈥檚 concerning,鈥� Comey said. 鈥淲e had an investigation open at the time so that gave me a queasy feeling.鈥�

Many Democrats still blame Comey for Clinton鈥檚 loss, leading Trump to apparently believe they would applaud him for firing Comey last month.

The opposite was the case as the firing created an enormous political firestorm that has stalled Trump鈥檚 legislative agenda on Capitol Hill and taken over Washington.

Under questioning Thursday, Comey strongly asserted the intelligence community鈥檚 conclusion that Russia did indeed meddle in the 2016 election.

鈥淭here should be no fuzz on this. The Russians interfered,鈥� Comey stated firmly. 鈥淭hat happened. It鈥檚 about as unfake as you can possibly get.鈥�

Trump has begrudgingly accepted the U.S. intelligence assessment that Russia interfered with the election. But he has also suggested he doesn鈥檛 believe it, saying Russia is a 鈥渞use鈥� and calling the investigation into the matter a 鈥渨itch hunt.鈥�

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Associated Press writers Julie Bykowicz and Mary Clare Jalonick contributed to this report.

Eric Tucker And Erica Werner, The Associated Press