The FBI report is confidential, and senators will be allowed to read it in a special secure room in the Capitol. Background checks do not traditionally contain investigators' conclusions about who they believe is credible. Unusually large numbers of Capitol Hill Police officers restricted movements in corridors and formed wedges around senators walking through hallways. He strongly denies the allegations.
In setting the voting process in motion, Majority Leader Mitch McConnell is likely to call for a final vote over the weekend.
Three Republican senators who will be crucial to deciding whether Brett Kavanaugh reaches the Supreme Court hit out at President Donald Trump on Wednesday after he unleashed an attack on Christine Blasey Ford, who has accused the judge of sexual assault.
Asked whether Trump's comments would affect her vote, Murkowski told reporters: "I am taking everything into account. You're not helping", Trump ally Sen.
"A man's life is in tatters", he said. Kavanaugh says that accusation is false.
He called Democrats who are against Kavanaugh "evil people" who want to "destroy people".
Democrats wrote to Senate judiciary committee chair Chuck Grassley, an Iowa Republican, challenging a Tuesday tweet by Republican aides saying prior investigations never found "a whiff of ANY issue - at all - related in any way to inappropriate sexual behavior or alcohol abuse". Trump said when he goes to political rallies, which are organized by Republicans, he sees that voters are angry at the "vicious and despicable" way Democrats are treating his nominee.
Lisa Murkowski of Alaska and Susan Collins of Maine.
The response came a day after Republican Sen.
"I don't think what he said is any different than what Justice Thomas said", Grassley said. Heidi Heitkamp (N.D.) and Joe Manchin III (W.Va.) also have yet to announce how they will vote. "And right now, that's sort of where our focus needs to be", said Sen.
Flake has clashed repeatedly with Trump over his behaviour and is retiring at year's end.
"I don't have all the answers, and I don't remember as much as I would like to", she said.
Imitating Dr Ford, he added, "But I had one beer - that's the only thing I remember".
"And this information comes on top of what has already been one of the most thorough, most exhaustive Senate reviews of any Supreme Court nominee in our nation's history".
White House spokeswoman Sarah Sanders also defended Mr Trump, telling a press briefing that the President was not concerned the comments may have endangered the votes of key senators.
File photo of USA president Donald Trump.
Last week Professor Christine Blasey Ford testified to the Senate Judiciary Committee that Mr Kavanaugh and another man had assaulted her when they were teenagers in the 1980s. She said he was simply "stating the facts" and complained that both Ford and Kavanaugh were "victims" of a Democratic plot to derail the nomination.
In Kavanaugh's case, such an investigation would have to begin with FBI interviews of both him and Ford, neither of which has occurred so far.
"We are profoundly disappointed that after the tremendous sacrifice she made in coming forward, those directing the FBI investigation were not interested in seeking the truth", Ford's counsel said.
The White House had approved on the very same day an additional supplemental background report from the Federal Bureau of Investigation after it was requested by Republican Sen.
The FBI has also questioned Deborah Ramirez, who says he exposed himself to her during a college party.
Asked if Trump was anxious that his comments would jeopardise votes from swing Republican senators, White House press secretary Sarah Huckabee Sanders said: "I don't think so".
The FBI must interview Mark Judge, the Kavanaugh friend identified by Ford as having been present during the alleged assault and as a somewhat reluctant participant. Flake has not said how he will vote if the nomination comes up this week.