But he does not recall the details of what Mr Papadopoulos said, Mr Sessions testified before the House Judiciary Committee.
The issue was becoming increasingly tense for the White House following the indictment of a top former Trump campaign official and a guilty plea from another foreign policy adviser.
Sessions said during January's confirmation hearing that he was unaware of communications between the campaign and Russian Federation.
The Kremlin has repeatedly denied allegations of interfering in the USA election and Trump denies any collusion between his campaign and Russian officials.
According to a source familiar with the matter, Sessions shut down Papadopoulos' idea of engaging with Russian Federation, and the Trump administration has played down Papadopoulos' role in the campaign, saying he was nothing more than a low level volunteer. "We do our duty everyday based on the facts".
The New York Times reported Tuesday that Pirro met with President Trump in early November during which she "excoriated" the attorney general for not investigating Clinton.
Sessions testified that he now remembers the meeting Papadopoulos, but his memory about conversations is limited. "I have always told the truth, and I have answered every question as I understood them and to the best of my recollection, as I will continue to do today".
"I will not accept and reject accusations that I have ever lied under oath".
Sixteen killed after boat capsizes in Vijayawada
They were helped by trained swimmers and local fishermen who launched rescue efforts when the boat capsized. The passengers were travelling to Pavitra Sangamam to see a daily ritual when the boat lost its balance.
He struck a similar note before the Senate Judiciary Committee last month, when he denied knowledge of communications between Russians and Trump campaign officials.
Boyd did acknowledge that the senior prosecutors would determine if any matters under investigation would merit the appointment of a special counsel.
During the March 2016 campaign meeting where Russia was discussed, Sessions shut down Papadopoulos' idea of engaging with Russian contacts, according to a source familiar with the matter.
WASHINGTON (AP) - The sale of Uranium One, a Canadian firm with rights to mine US uranium, to a Russian company is in the news again with the Department of Justice signaling it could appoint a special counsel to look into the matter.
"I'm not able to answer that", he repeated multiple times to Ohio Republican Rep. Jim Jordan as he asked about the dossier.
In this April 6, 2017, photo, former Secretary of State Hillary Clinton speaks during the Women in the World Summit at Lincoln Center in NY.
Some Republicans have also called for investigations into the Uranium One deal, including Senator Chuck Grassley of Iowa and Representative Bob Goodlatte of Virginia - both chairmen of congressional committees that oversee the Justice Department.
"I would say it is improper to influence - ah - it would be - a president can not improperly influence and investigation, and I have not been improperly influenced and would not be improperly influenced", Sessions continued.