Sessions told the House Judiciary Committee he had no recollection of a 2016 meeting with Trump campaign aide George Papadopoulos, who discussed his contacts with people who said they could arrange a meeting between Trump and Russian President Vladimir Putin, until recent news reports showed he had chaired the meeting.
'In all of my testimony, I can only do my best to answer all of your questions as I understand them and to the best of my memory,' Sessions said. 'But I will not accept and reject accusations that I have ever lied under oath. That is a lie.'
WATCH: Sessions on bias with regards to DOJ investigations
Sessions Denies Decisions Based on Bias, Politics
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Since his last appearance before a congressional panel in mid-October, news surfaced that Papadopoulos had pleaded guilty in early October to lying to federal agents investigating Trump campaign links to Russia and is cooperating with special counsel Robert Mueller's criminal investigation.
Prosecutors said in court records that at a March 2016 meeting, about seven months before the presidential election, Papadopoulos told Sessions, Trump and others that he had connections that could arrange the Trump-Putin meeting. Sessions said he 'pushed back' against Papadopoulos's idea and the Trump-Putin meeting never occurred in the midst of the campaign.
At his January confirmation hearing to become attorney general, the top U.S. law enforcement position, Sessions said he was unaware of communications between the campaign and Russia, but later acknowledged he himself had met then Russia's then-ambassador to Washington, Sergei Kislyak.
FILE - Former Trump campaign adviser George Papadopoulos is seen in an undated photo (George Papadopoulos/LinkedIn)
Sessions attributed his failure to remember the Papadopoulos meeting, as well as a contact with Carter Page, another Trump aide who was making overtures to Russia, to the chaos of the Trump campaign.
'It was a brilliant campaign in many ways,' Sessions said. 'But it was a form of chaos every day from day one. We traveled all the time, sometimes to several places in one day. Sleep was in short supply.'
One Sessions critic, Democratic Senator Al Franken of Minnesota, told the Senate Monday, 'Attorney General Sessions has misrepresented the truth...time and time again.'
Sessions also defended his directive for senior federal prosecutors to examine issues raised by Republican lawmakers connected to Trump's election challenger, Democrat Hillary Clinton.
He said any new probes would be conducted 'without political influence. They will be done properly.'
Committee chairman Rep. Robert Goodlatte, asked Sessions in July and September to appoint a special counsel to investigate allegations of collusion between Clinton's campaign and the Democratic National Committee, issues linked to her use of a private email system while serving as secretary of state, contributions to her family's Clinton Foundation, and an Obama-era purchase of American uranium mines by a Russian-backed company.
The letter also asked for an examination of certain aspects of the Federal Bureau of Investigation's probe into Russian meddling in the 2016 election.
FILE - House Judiciary Committee Chairman Rep. Bob Goodlatte, R-Va., listens to testimony on Capitol Hill in Washington.
Assistant Attorney General Stephen Boyd responded in a letter to Goodlatte on Monday that prosecutors would report directly to Sessions and Deputy Attorney General Rod Rosenstein 'as appropriate' and recommend whether any investigations should be opened or expanded. He further pledged the Justice Department 'will never evaluate any matter except on the facts and the law.'
President Donald Trump has strongly criticized an investigation by former FBI chief Robert Mueller into allegations of Russia's role in the election and possible collusion with the Trump campaign. U.S. intelligence agencies concluded in a January report Putin directed an effort to help Trump's chances of winning and to undermine American democracy.
Trump has repeatedly called for more law enforcement scrutiny of Clinton.
'Everybody is asking why the Justice Department (and FBI) isn't looking into all of the dishonesty going on with Crooked Hillary and the Dems...'' Trump tweeted last month.
FILE - The leaders of the House Intelligence Committee, Rep. Adam Schiff, D-Calif. (C), and Rep. Mike Conaway, R-Texas (R) speak with reporters after a closed-door meeting at the Capitol with Sheryl Sandberg, chief operating officer of social media giant Faceboo
The president's comments and the move by Sessions brought complaints from Democrats about executive interference with the judicial branch.
'If the AG bends to pressure from President Trump and his allies, and appoints a special counsel to investigate Trump's vanquished rival, it could spell the end of the DOJ as an independent institution,' Rep. Adam Schiff said on Twitter.
Rep. Gregory Meeks said the attorney general's actions were a 'political smokescreen' meant to distract from collusion between the Trump campaign and Russia.
'The President and Sessions just politicized the Dept. of Justice, trampling on this country's sacred rule of law,' Meeks tweeted.
Rep. Andy Biggs, who was one of the Republicans who signed onto Goodlatte's letter, said the Justice Department's response is 'encouraging,' but not as decisive as the lawmakers would have liked.
'We must have an unbiased, independent special counsel to investigate the matters we have raised. We have spent long enough on meaningless evaluations and empty promises,' Biggs said in a statement.