During Comey's hearing before the Senate Intelligence Committee, he hinted at Sessions' role in the controversy.
He recused himself in March from involvement in the FBI's Russia investigation after he failed to disclose two conversations he had with Russian ambassador Sergey Kislyak.
As attorney general, Sessions is unlikely to answer in detail questions about conversations he's had with Trump.
Sessions said it was a "detestable and appalling lie" to suggest he participated in or was aware of any collusion between Russian Federation and the Trump campaign.
The hearing comes on the heels of two canceled appearances, with Sessions citing Comey's testimony last week.
Attorney General Jeff Sessions was never briefed on alleged Russian meddling in last year's presidential election, even after becoming the top law enforcement officer in the country, he said Tuesday in testimony before the Senate Intelligence Committee.
US Attorney General Jeff Sessions on Tuesday vehemently rejected the suggestion he colluded with Russian Federation to tilt last year's election in Donald Trump's favor, branding the accusations an "appalling and detestable lie". "If I can just finish".
Sessions said that he was not sure what was "explicitly" in Trump's mind when he made a decision to fire Comey.
John Oliver Is Relishing The Swift Downfall Of Trump's Credibility
"Just listen to the fantastic reason Comey gave for taking detailed notes on his meetings with Trump", Oliver said before tossing to a Comey clip.
And asked about Trump's own contention that he fired Comey with the Russian Federation probe in mind, and regardless of any recommendation from anyone else, Sessions said: "I guess I'll just have to let his words speak for themselves".
However, another Republican, House Speaker Paul Ryan, told reporters, "I think the best case for the president is to be vindicated by allowing this investigation to go on fairly and independently".
Attorney General Jeff Sessions fired back at accusations he acted improperly in dealing with Russians as a representative of the Donald Trump presidential campaign, while declining to answer questions about private conversations with the president.
Congressional GOP leaders, including House Speaker Paul Ryan, R-Wis., and Senate Majority Leader Mitch McConnell, R-Ky., both expressed faith in Mueller on Tuesday. An order from the president would not necessarily qualify, he said.
"That regulation states, in effect, that Department employees should not participate in investigations of a campaign if they have served as a campaign advisory". Sessions argued that in the context of the hearing, "my answer was a fair and correct response to the charge as I understood it". He's facing a Senate committee that is still fuming from last week's unsuccessful grilling of the intel chiefs, all of whom not only refused to give answers but also refused to give legal justification for their silence. "President, I can't talk about that, '" Sessions testified. "You're impeding this investigation", fumed Sen. He did not say he was using executive privilege, but rather adhering to longstanding tradition of Justice Department leaders not revealing private conversations with the president.
"He told me repeatedly that he had talked to lots of people about me, including our current attorney general, and had learned that I was doing a great job and that I was extremely well-liked by the Federal Bureau of Investigation workforce", Comey told the committee. "You either answer the question under oath, or you invoke executive privilege".
"Mr. Comey said that your continued engagement with the Russian Federation investigation was, quote, 'problematic, ' and he could not discuss it in public", Wyden noted.
Besides Wyden, several other Democratic senators pressed Sessions over his refusal to discuss his conversations with President Trump over Comey's firing.
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