The email went to "several members of the Campaign's foreign policy team", prosecutors alleged.
The revelations revived questions about Sessions's credibility.
Trump told reporters on Friday that many people were unhappy with the Department of Justice, including him. The Minnesota Democrat said the latest disclosure suggests that the American people "cannot trust your word". The new information is renewing attention to how forthcoming Sessions has been with Congress.
"The description of the March 2016 meeting contained in unsealed court documents is impossible to reconcile with the attorney general's appearance before the Judiciary Committee just two weeks ago", Leahy said. If Sessions were pushed out, it would give Trump the chance to appoint a new attorney general - who would have the authority to fire Mueller and take over the Russian Federation probe. Sessions was head of the panel.
The same documents that disclosed the meeting show Papadopoulos has pleaded guilty to lying to the Federal Bureau of Investigation about his contact with Russians during the 2016 campaign.
This morning the president said he doesn't remember the details of a March 2016 meeting with his campaign's national security team - a meeting that has taken on increased significance as the special counsel investigating Russian interference in the 2016 election this week announced the first charges in the inquiry.
Sessions immediately rejected the proposal to arrange a meeting and thought that put an end to the idea, according to a person familiar with the matter who asked not to be identified commenting on private discussions. He said Sessions did not react or comment one way or the other.
In numerous media interviews in recent months, the adviser, Carter Page, has either denied meeting Russian government officials during a July 2016 trip to Moscow or said he met "mostly scholars", the newspaper said. He also testified that he was "not aware" of anyone affiliated with the Trump campaign communicating with the Russians. "Completely unrelated to my limited volunteer role with the campaign and as I've done dozens of times throughout my life".
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"He seems to have problems telling the truth on this subject", Franken said of Sessions.
During his confirmation hearing in January, Sessions denied any knowledge that members of the Trump campaign communicated with Russian officials.
Sen. John Cornyn, the No. 2 in Republican leadership who serves on the intelligence and judiciary panels, said he was unaware of Sessions' attendance at that meeting until now.
"I did not, and I'm not aware of anyone else that did, and I don't believe it happened", Sessions replied.
"Jeff Sessions was the head of the national security operation" in Trump's campaign, Senator Richard Blumenthal of CT, a member of the Judiciary Committee, said in an interview. And I warn you, there is some loud helicopter noise behind him.
On Wednesday, Democrats said Sessions needs to clarify his comments. He answered some questions from reporters.
Jonathan Turley, a professor at George Washington University law school, said he views a perjury case against Sessions as weak.