However, Reuters reports that several witnesses who say they have information about the case have tried and failed to speak with FBI investigators.
The report was arriving 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.
Under pressure, U.S. President Donald Trump ordered the FBI investigation following a dramatic Senate hearing last week in which university professor Christine Blasey Ford detailed a sexual assault she says was carried out by Kavanaugh and his friend, Mark Judge, at a high school party in 1982.
Democrats also demanded that the FBI privately brief the Senate about the investigation before the chamber votes.
Senate minority leader Chuck Schumer, Democrat of NY, fired back in remarks after McConnell, saying the weeklong delay to the let the FBI investigate came at the request of Republican senators who weren't prepared to vote for Kavanaugh's nomination.
Recent polls show a majority of women think the Senate should not confirm Kavanaugh.
Dr. Christine Blasey Ford gives her opening statement at the US Senate Judiciary Committee.
Arizona sex crimes prosecutor Rachel Mitchell was hired by Republicans to ask questions of Mr Kavanaugh and Dr Ford during hearings - a move Democrats attacked because neither were on trial. Two Republican votes against Kavanaugh's confirmation sinks it if every Democrat votes no.
President Donald Trump is pictured gesturing as he speaks during a rally in Southaven, Mississippi.
Republican leaders and White House officials said the strict limitations on who would see the results are standard practice for background checks on nominees for senior roles.
Theresa May says Britain to stop favouring European Union workers after Brexit
It also appeared aimed at showing the prime minister to be at ease and in charge at a momentous moment for Britain. Forty-eight lawmakers would need to write such letters to trigger a vote of confidence in the leader.
FILE - In this February 15, 2018, photo, Sen.
Sen. Chris Coons, the Democrat from DE who worked with Republican Sen.
Later Wednesday morning, Collins similarly told reporters that "the president's comments were just plain wrong". Lisa Murkowski, R-Alaska, called it "wholly inappropriate and in my view unacceptable", and Sen.
Sen. Jeff Flake, R-Ariz., looks on during an appearance at the Forbes 30 Under 30 Summit, Oct. 1, 2018, in Boston.
The two other Republican female senators say victims should be heard, but they want Kavanaugh confirmed. "'I don't remember, '" Mr. Trump said at the rally to support Republican candidates in MS, re-enacting Ford's testimony for the audience.
"Oh, good. How'd you get home?"
I blew a few smoke rings, remembering those years [in high school].
Blumenthal told Wolf Blitzer on CNN's "The Situation Room" that "The clarification of that tweet would require me to go into the FBI report, but what that tweet highlights very dramatically and directly is the need for a full investigation, and for the public to know what's in that investigation, which is why it should be made public and why the facts here are really so important". 'I don't know.' Upstairs, downstairs, where was it? I don't know. I don't know.
Administrators at the prestigious college emailed students late Monday to say Kavanaugh "indicated that he can no longer commit to teaching his course in January Term 2019, so the course will not be offered".
White House spokeswoman Sarah Sanders did not answer a question Wednesday about whether Trump wants the report made available to the public.
Sen. Mazie Hirono, D-Hawaii, who is on the Senate Judiciary Committee, called for as much transparency as possible, and she would not rule out reading the report on the Senate floor.