Protesters occupy the Senate Hart building during a rally against Supreme Court nominee Brett Kavanaugh on Capitol Hill in Washington. Hundreds of demonstrators were arrested, including actress Amy Schumer.
"There is no question the Kavanaugh fight has provided a burst of energy to Republican voters at a critical time", said Brian Walsh, a Republican strategist and former staffer for the party's Senate campaign committee.
What they did say was that the FBI investigation left too many stones unturned for the Senate to be moving ahead with a vote.
No Republicans have said they will vote against Mr Kavanaugh, although four have not committed to supporting him. Lisa Murkowski of Alaska, Jeff Flake of Arizona and Susan Collins of ME, along with Sen.
A reported nine people were interviewed in the FBI's five-day investigation. Those who signed the letter said Kavanaugh was "repeatedly aggressive" in his remarks, was "discourteous to senators" and "exhibited a lack of commitment to judicious inquiry".
Speaking to reporters after reviewing the FBI report, Collins said it "appears to be a very thorough investigation".
While some Democrats have lent credence to her claims, most senators have avoided them.
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Democratic Sen. Tammy Duckworth of IL told reporters Thursday that time slots for reading the Federal Bureau of Investigation file are so full that senators are being told they might have to wait until Friday to read it. In an October 3 piece for Politico, journalist Matthew Miller stressed that Democrats needed to be aggressive and proactive in demanding a more comprehensive investigation of Kavanaugh.
The senator cited Christine Blasey Ford, who accused Kavanaugh of sexually assaulting her in the early 1980s, in her statement, saying, "When I listened to Dr. Ford testify, I heard the voices of women I have known throughout my life who have similar stories of sexual assault and abuse".
Late on Thursday, Senate Judiciary Committee Chairman Chuck Grassley (R-IA) sent a letter to Ford's legal team over evidence they would still like to receive including the therapist notes Ford has repeatedly referred to as documentation of her allegation against Kavanaugh as well as the materials from the polygraph exam she took in August.
On the eve of a dramatic day in the Senate that could dictate his fate, and with several key Republicans undecided, Kavanaugh attempted damage control in an opinion article in the Wall Street Journal.
He wrote that his testimony "reflected my overwhelming frustration at being wrongly accused". He says he was, quote, "subjected to wrongful and sometimes vicious allegations" and that he, quote, "might have been too emotional at times" during his Senate hearing.
Kavanaugh called the judicial system the "crown jewel of our constitutional republic" and noted that the Supreme Court is "the last line of defense for the separation of powers, and for the rights and liberties guaranteed by the Constitution".
A week after a televised Senate Judiciary Committee hearing at which Kavanaugh and Ford transfixed the nation, the Capitol campus remained a stew of tension as the election-season cliff-hanger neared its conclusion. Their decision could make or break Kavanaugh's nomination.
The Senate, in which the Republican have a narrow 51-49 majority, is due to vote on Kavanaugh's confirmation on Saturday. The nomination battle boiled down to a "he said, she said" conflict requiring senators to decide between diametrically opposed accounts offered by Kavanaugh and Ford.