The report had become the central focus of the debate over Judge Kavanaugh, with Democrats hoping it would corroborate allegations from Christine Blasey Ford and Deborah Ramirez, two women who say the judge groped or exposed himself to them during those parties.
Blasey Ford testified last week that Kavanaugh sexually assaulted her at a house party in the early 1980s while they were in high school.
Actress Amy Schumer was shown in line appearing to prepare to be arrested in the Senate building amid the protest.
A major procedural vote in the Senate is scheduled to take place on Friday morning on Supreme Court nominee Brett Kavanaugh's confirmation, as three of four key moderate swing-vote senators are "trying to get to yes", a GOP source told Fox News. Jeff Flake, R-Ariz. Meanwhile, multiple Republicans have said that the document contains no evidence against Kavanaugh.
Republicans hold 51 seats in the Senate and changed Senate rules previous year to end filibusters for Supreme Court nominees.
Trump has stoked outrage over the Kavanaugh hearing on the campaign trail, enthusiastically using it as Exhibit A in why Republicans need to retain control of Congress.
Susan Collins, a crucial unknown vote: "It appears to be a very thorough investigation".
Republicans, meanwhile, were convinced that the reports would back up the judge's vehement denials, and they emerged more satisfied, saying the Federal Bureau of Investigation found "no hint" of evidence to back up the women's claims.
Supreme Court nominee Brett Kavanaugh has written an op-ed in The Wall Street Journal defending his independence and impartiality.
With the rest of his party straining for the chance to elevate Kavanaugh and enshrine a conservative majority on the court that will validate half a century of movement politics, McConnell can only afford to lose one vote from his side.
Mr Kavanaugh, a 53-year-old Yale University graduate, had been cruising to confirmation to the Supreme Court before a string of allegations from his student days surfaced late in the process. Kavanaugh himself has categorically denied the accusations against him, calling them "last minute smears" created to delay his nomination process further.
Kavanaugh wrote in the opinion piece that his testimony "reflected my overwhelming frustration at being wrongly accused".
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"I was subjected to wrongful and sometimes vicious allegations", he wrote.
But underscoring the uncertainty and political tumult around the nomination, retired Supreme Court Justice John Paul Stevens said that he didn't believe Kavanaugh should be confirmed.
Kavanaugh said he was grateful to participate in the process leading up to his initial hearing - but harshly criticized the turmoil that followed.
While Republican leaders were not saying they had nailed down the support needed, backing from two of those three would ensure Mr Kavanaugh's confirmation because every other Republican was poised to back him.
Her powerful account, along with Kavanaugh's angry rebuttal, has divided the country, rekindling the national conversation on sexual misconduct and the burden of proof in the #MeToo era.
That could back up the review into the first vote, on whether to advance Kavanaugh's nomination.
"To discuss something this sensitive at a political rally is just not right".
The FBI report was not released to the public. If so, that could be enough for a Trump victory in this battle.
White House spokesman Raj Shah rebuffed Democrats' complaints.
Police rounded the protesters up in a Senate office building after they sat down and refused to budge.
Vocal opponents to President Trump's nominee for the nation's high court chanted near the steps of the courthouse; some of Kavanaugh's supporters demonstrated as well.
Senate Majority Leader Mitch McConnell is moving ahead full steam, saying the Senate will convene at 9:30 a.m. and a cloture vote, a test vote, will happen an hour later.