Papadopoulos pleaded guilty to lying to the Federal Bureau of Investigation in its probe of Moscow's meddling in last year's election, special counsel Robert Mueller announced Monday.
Sessions and Trump have both previously said that they had no knowledge of any communications between campaign members and Russian Federation - statements that appear to be contradicted by the revelations of Papadopoulos' and Page's meetings.
In an interview with CNN's Wolf Blitzer on Friday, Lieu said that recent revelations that two former foreign policy advisers for the Trump campaign met with Russian representatives during the presidential race provided clear evidence that Sessions had lied in his testimony before the Senate Judiciary Committee.
Following former Trump advisor Carter Page's six hour closed-door testimony on Thursday, Attorney General Jeff Sessions has come under fire by Democrats for allegedly knowing about Russia's involvement in the 2016 election while serving on the Trump campaign.
Democratic Senators Richard Blumenthal (Conn.) and Patrick Leahy (Vt.) issued statements demanding Sessions testify before the Senate Judiciary Committee.
"Let's remember that this is about Russian interference in our election and that is at the very heart of our system of democracy and we're trying to find out whether the Trump campaign cooperated", Franken said.
Trump again urges death penalty for NYC suspect
Trump tweeted. "There is also something appropriate about keeping him in the home of the disgusting crime he committed". Saipov in this judicial process will say a lot more about us than it will say about him", Patton said.
J.D. Gordon, a former Pentagon spokesman and Trump adviser who attended the meeting, also recalled that Sessions "shut him down" when Papadopoulos announced that he could introduce Trump to Putin. "As far as Sessions seemed to be concerned, when he shut down this idea of Papadopoulos engaging with Russian Federation, that was the end of it and he moved the meeting along to other issues". Other aides were wary of the idea before Sessions himself "spoke vehemently against the idea" and asked others not to discuss it, the Times reported earlier this week.
A source close to Sessions defended the attorney general, promising he "has been entirely truthful and consistent on this matter".
Sen. Al Franken (D-Minn.) demanded that Sessions clarify his past statements and Sen.
"I think there are many more questions for Jeff Sessions", said Sen. Coal industry advocate tapped for mining regulator Bipartisan groups call on DOJ to scrutinize AT&T-Time Warner merger MORE "absolutely" committed perjury when he told lawmakers earlier this year that he was unaware of any contacts between Trump campaign officials and Russians.
"I'm really not involved with the Justice Department". However, news reports from March revealed that Sessions had met twice with Russian Ambassador Sergey Kislyak in the lead up to the 2016 USA presidential election.
"What happens if you get a new Attorney General - and the Democrats can't blame the president because they are the ones pushing them out - and then this new guy comes and says, 'Guess what?"