In addition to Leahy and Blumenthal, Senators Al Franken (Minn.) and Chuck Schumer (NY) are calling for the attorney general to testify.
Former Trump foreign policy adviser Carter Page privately testified Thursday that he mentioned to Jeff Sessions he was traveling to Russian Federation during the 2016 presidential campaign -- as new questions emerge about the attorney general's comments to Congress about Russian Federation and the Trump campaign.
Asked under oath at a Senate hearing last month if he believed Trump campaign surrogates had communications with Russians, Sessions replied, "I did not and I'm not aware of anyone else that did, and I don't believe it happened".
"Understandably, it was as irrelevant then as it is now", Page told CNN.
Lindsey Graham during an October 18 Senate Judiciary Committee oversight hearing.
Attorney General Jeff Sessions is once again under scrutiny on Capitol Hill regarding his candor about Russia and the Trump campaign amid revelations that he rejected a suggestion to convene a meeting between Russian President Vladimir Putin and Donald Trump previous year.
"All I can tell you is this: there was no collusion, there was no nothing", he told reporters. "I am deeply troubled that this newest revelation strongly suggests that the Senate-and the American public-cannot trust your word".
Sessions appeared before the Senate Judiciary Committee again in October.
"He now needs to come back before the Committee, in person, under oath, to explain why he can not seem to provide truthful, complete answers to these important and relevant questions", Leahy said in a statement.
The source added that Sessions "has no clear recollection" of Papadopoulos and any further interactions with him, even though two were seated next to each other at a second meeting of Trump's foreign policy team at the Capitol Hill Club steps from the House.
Papadopoulos, 30, attended a meeting with then-candidate Trump and members of his campaign team at which he offered to set up a meeting between Trump and Russian President Vladimir Putin, according to a court filing.
The meeting in question occurred on March 31, 2016.
The Justice Department did not immediately respond to a request for comment Thursday evening.
The Democratic senator said he did not know White House adviser Jared Kushner's role in the firing, and declined to weigh in on any potential wrongdoing on Kushner's part, including Kushner's multiple amendments to his security clearance form.
During his January 10 confirmation hearing, Sessions said he was "not aware" of anyone affiliated with the Trump campaign coordinating with the Russian government when asked about such ties by Franken. Jeff Sessions, R-Alabama, who now serves as US attorney general, and J.D. Gordon, a Trump adviser and former Pentagon official, according to The Washington Post.