Three Republican Senators - Jeff Flake, Susan Collins and Lisa Murkowski - are being closely watched, as they have not yet said how they will vote.
He added: "This investigation found no hint of misconduct".
That means that if all Democrats vote against confirming Mr Kavanaugh, Republicans can only afford one defection - since in a tie, Vice-President Mike Pence would get the casting vote. They include Charles "Chad" Ludington, who has challenge Kavanaugh's testimony about his drinking and said Kavanaugh was "a frequent drinker, and a heavy drinker".
Protesters have been coming to Washington in waves since last week, when both Kavanaugh and Christine Blasey Ford, one of Kavanaugh's accusers, testified before the Senate Judiciary Committee in hearings that seen around the world.
That newfound enthusiasm, which Republicans strategists say they are seeing around the country, could bolster Republicans in close Senate battles in Florida, North Dakota, Missouri, Montana, Indiana, Tennessee, Texas and West Virginia - all states carried by Trump in 2016.
Others who knew Kavanaugh in high school and college have also described him then as a heavy and frequent drinker. Kavanaugh has denied the accusations.
The Kavanaugh fight has riveted Americans weeks before November 6 elections in which Democrats are trying to take control of Congress from the Republicans. The vote is not a final verdict on Kavanaugh but is likely to establish his chances of reaching the Court.
Have a cellphone? Expect a message from the feds this afternoon
ET on Wednesday, though FEMA says it might take a few minutes for the test to make it to all phones. On Wednesday, October 3, 2018, at 12:18 p.m. (MST) you'll receive a TEST text message.
Texas wave pool closes after surfer dies from 'brain-eating amoeba'
The Centers for Disease Control and Prevention said contaminated water can enter through the nose and pass through the body. The BSR pool has voluntarily closed its facilities so that a small CDC team can collect samples for testing.
Trump mocks woman who accused Brett Kavanaugh of sexual assault
President Trump reiterated his support for Mr Kavanaugh on Tuesday, saying he believed the Senate would approve the judge. The stakes are high because Kavanaugh's confirmation would consolidate conservative control of the Supreme Court.
"An FBI supplemental background investigation that did not include an interview of Dr. Christine Blasey Ford - nor the witnesses who corroborate her testimony - can not be called an investigation", her legal team said in a statement.
Protesters occupy the Senate Hart building during a rally against Supreme Court nominee Brett Kavanaugh on Capitol Hill in Washington, DC.
The report arrived at a Capitol palpably tense over the political stakes of the nomination fight and from aggressive anti-Kavanaugh protesters who have rattled and reportedly harassed senators. Heitkamp is in a tough re-election battle in a state Trump by nearly 36 percentage points.
Just a single copy of the report was produced, which was not made public.
CBS News has confirmed that the Federal Bureau of Investigation limited its scope at the direction of Republicans and the White House.
One Republican Senator, John Cornyn, raised eyebrows by telling his party this was "our Atticus Finch moment", a reference to the lawyer in classic novel To Kill A Mockingbird who refutes a false rape allegation.
Prof Blasey Ford testified last week at a dramatic Judiciary Committee hearing that when she was 15, a drunken 17-year-old Kavanaugh pinned her down, tried to remove her clothing and covered her mouth after she screamed. "Who among us would not have been outraged by having a lifetime record drug through the mud with accusations that can not be proven". "The second thing we know for sure is that there's no way anything we did would satisfy the Democrats".
The FBI has completed its limited, supplemental investigation into sexual misconduct claims about Supreme Court nominee Brett Kavanaugh, with US senators set to review the FBI's summaries of interviews with witnesses today.
That could back up the review into the first vote, on whether to advance Kavanaugh's nomination. He forcefully denied the allegations.