In the plea deal documents released by Mueller on Monday, Papadopoulos recounted a meeting in which he suggested setting up a meeting with then-candidate Trump and some Russians he knew with potentially damaging information about Clinton. Al Franken, the Minnesota Democrat, accused him of failing "to tell the truth about your interactions with Russian operatives during the campaign". "I have been called a surrogate at a time or two in that campaign and I didn't have - did not have communications with the Russians, and I'm unable to comment on it".
Blumenthal wrote Sessions that he should "immediately come before the Senate Judiciary Committee to update [his] testimony and correct any omissions and any statements that may have been incorrect or misleading".
President Donald Trump says he does not remember much about a meeting a year ago with a former campaign aide who pleaded guilty this month as part of a federal probe into alleged Russian meddling in the 2016 USA election.
US Attorney General Jeff Sessions must testify again before Congress on the Trump campaign's dealings with Russian contacts, senate Democrats demanded on Thursday.
Asked if Sessions should amend his testimony before his committee, Grassley told CNN: "I'm looking into it".
He said one person was a "senior person", but he would not reveal the person's identity.
Franken asked: "If there is any evidence that anyone affiliated with the Trump campaign communicated with the Russian government in the course of this campaign, what will you do?"
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Senator Lindsey Graham, a Republican member of the Judiciary Committee, said it makes sense to ask Sessions to clarify the chain of events and how he reconciles it with his testimony before the committee.
In previous interviews, Page had denied meeting with any Russian government officials during the July 2016 trip, which included visiting Moscow's New Economic School, saying he met with "mostly scholars".
"Back in June 2016, I mentioned in passing that I happened to be planning to give a speech at a university in Moscow".
Franken added, "This is another example in an alarming pattern in which you, the nation's top law enforcement officer, apparently failed to tell the truth, under oath, about the Trump team's contacts with agents of Russia-a hostile foreign power that interfered in the 2016 election".
It is the latest example to emerge of a Trump aide meeting with Russian officials during the 2016 election after initially denying that such contacts occurred.
"He may still have technically answered the question correctly", said Representative Jerrold Nadler, a New York Democrat.
"Which is why it's such a mystery why George Papadopoulos... would lie to the Federal Bureau of Investigation about his meetings with Russians when they weren't illegal".