Minority Leader Chuck Schumer, D-NY, said Sessions should not be involved because of potential conflicts of interest and because of Justice Department regulations that prohibit individuals with political ties to the subjects of an investigation from leading it.
President Donald Trump nominated Sessions for the attorney general's post and the senator was one of his earliest and staunchest backers in Congress.
But Republicans continued to brush off demands from Democrats for a Watergate-style probe, insisting investigations underway by the House and Senate intelligence committees are adequate.
Schumer and other Democrats spoke to reporters as Trump criticized the intelligence agencies that he oversees and the media for what he described as unfair treatment of his former national security adviser, Michael Flynn, and for "illegally leaked" information about reported contacts between his campaign aides and Russian officials.
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Flynn was forced to resign Monday following reports he misled Vice President Mike Pence about contacts with a Russian diplomat. Late yesterday, The New York Times reported that US agencies had intercepted phone calls last year between Russian intelligence officials and members of Trump's 2016 campaign team.
Senator John McCain of Arizona, the Republican chairman of the Senate Armed Services Committee, didn't rule out an independent probe but said he and other lawmakers "need to find out a lot of basic information" first about Flynn's communications and the alleged contacts involving Trump's campaign.
"Something like this always sucks the oxygen out of the room," McCain said. "The president's national security adviser did not tell the vice president of the United States the truth and had to be fired. It brings up a lot of questions and those questions need to be answered. Right now, without a national security adviser and everything else that's going on in the White House, it is dysfunctional on national security.
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