The FBI report contains summaries of interviews that the bureau has conducted. Nine people were reportedly interviewed, but not Brett Kavanaugh or the woman who first accused him of assault.
The report is in paper format only and no copies will be made. It is being held in a secure room in the basement of the Capitol building, known as a Sensitive Compartmented Information Facility, or “SKIF”.
Senators have been told not to reveal its contents, but some have already begun to describe its findings.
Senator Bob Corker said the FBI report is 46 pages long.
Democrats have raised concerns the investigation has been too narrow in scope, with key witnesses not interviewed.
In a letter to FBI Director Christopher Wray on October 4, the lawyers for the first woman accusing Brett Kavanaugh of assault, Professor Christine Blasey Ford, criticized investigators for not speaking with more than a dozen alleged witnesses whose names she provided.
In a statement after reading the FBI report, chairman of the Senate Judiciary Committee, Charles Grassley, said: “There’s nothing in it that we didn’t already know”, and that the FBI “found no hint of misconduct”.
Democratic Senator Dianne Feinstein called it an “incomplete investigation”, adding that “the most notable part of this report is what’s not in it”.
Swing Republican Senator Jeff Flake of Arizona – like other Republicans – said it contained “no additional corroborating information”.
Moderate Republican Susan Collins of Maine, who also has not announced how she will vote, said it “appears very thorough”.
Christine Blasey Ford testified to the Senate committee that Brett Kavanaugh had assaulted her when they were teenagers in the 1980s.
Judge Kavanaugh angrily denied that he had ever assaulted her or anyone else.
Mark Judge, a high school friend of Brett Kavanaugh who Christine Blasey Ford says was in the room at the time of the assault, has said he will co-operate with any law enforcement agency that will “confidentially investigate” the allegations.
He has already denied Christine Blasey Ford’s allegations.
Two others who were allegedly present in the house during the alleged assault, PJ Smyth and Dr. Ford’s friend Leland Ingham Keyser, are willing to co-operate “fully” with the FBI’s investigation, their lawyers said.
A third woman who has also publicly accused Brett Kavanaugh, Julie Swetnick, alleges he was involved in the drugging and assault of girls at house parties in the 1980s.
Hulie Swetnick says she was the victim of a gang rape in 1982 at a party attended by Brett Kavanaugh.
Her lawyer said on Septemeber 29 that they had yet to hear from the FBI.
Announcing the FBI investigation, President Trump said: “I’ve ordered the FBI to conduct a supplemental investigation to update Judge Kavanaugh’s file.
“As the Senate has requested, this update must be limited in scope and completed in less than one week.”
The inquiry involves the FBI reopening its previously completed background check on Brett Kavanaugh. This may mean going back to old witnesses – or speaking to new ones.
Christine Blasey Ford’s lawyer said her client welcomed the step but questioned the time limit of a week to hold the investigation.
Republicans are pushing to vote on Judge Brett Kavanaugh for the Supreme Court on September 28, after hearing dramatic testimony from him and Prof. Christine Blasey Ford, who is accusing him of assault.
President DonaldTrump has urged the Senate – where Republicans have a majority – to vote.
This is expected next week, although the outcome is far from certain with a number of senators on both sides undecided.
The American Bar Association has called for a delay of the vote to allow the FBI to investigate the claims by Christine Blasey Ford and other women.
The Supreme Court plays a vital role in political life – appointed for life, its nine members have the final say on US law.
This includes highly contentious social issues, such as abortion, and challenges to government policy.
Brett Kavanaugh’s appointment would tilt the balance in favor of conservatives for years to come.
For this reason, Republicans accuse the Democrats of seeking to delay the confirmation until after the mid-term elections in November when they hope to win enough seats to stop it altogether.
The hearing, which lasted for nine hours, brought an outpouring of support for Christine Blasey Ford – a university professor – from the #MeToo movement against harassment and assault.
President Donald Trump’s nominee, at times emotional and angry, denied assaulting Christine Blasey Ford when they were teenagers.
The 51-year-old, close to tears, described the incident in detail saying it had “drastically” affected her life.
Prior to September 27, no-one had heard from Christine Blasey Ford publicly since the allegations arose.
After addresses by the leading Republican and Democrat senators, she delivered her statement, at times close to tears.
“I am here today not because I want to be,” she said.
“I am terrified. I am here because I believe it is my civic duty to tell you what happened to me while Brett Kavanaugh and I were in high school.”
Christine Blasey Ford alleged Brett Kavanaugh and his friend Mark Judge had locked her in a bedroom during a small gathering at a house in a Washington DC suburb in the summer of 1982, when she was 15 and Brett Kavanaugh was 17.
She said Brett Kavanaugh had tried to remove her clothing, pinned her to a bed and groped her. Both men were “drunkenly laughing”, she said.
Prof. Ford added: “Brett’s assault on me drastically altered my life. For a very long time, I was too afraid and ashamed to tell anyone the details.”
Under questioning by a Democratic senator, Christine Blasey Ford said her most vivid memory was “the laughter between the two and their having fun at my expense… They were laughing with each other – two friends having a really good time with one another”.
In an answer to a question from another Democrat about claims of mistaken identity, she said she was “100%” certain that Brett Kavanaugh had assaulted her.
Many of the 10 Democrats in the 21-person committee praised her for coming forward – and supported her call for an FBI investigation into her allegations.
The 11 Republicans, all men, deferred most of their questions to a lawyer, Phoenix prosecutor Rachel Mitchell.
Brett Kavanaugh responded by taking a combative approach but occasionally became emotional.
“This confirmation process has become a national disgrace,” the 53-year-old federal judge told the committee.
“The constitution gives the Senate an important role in the confirmation process, but you have replaced advice and consent with search and destroy.
“Since my nomination in July there has been a frenzy on the left to come up with something, anything to block my confirmation.”
Brett Kavanaugh insisted he would not be “intimidated” into withdrawing from the process.
He said: “You may defeat me in the final vote but you’ll never get me to quit. Never.”
Brett Kavanaugh said he did not doubt that Christine Blasey Ford had been assaulted, but insisted: “I’ve never s**ually assaulted Dr Ford – or anyone.”
He admitted he had drunk beer while at high school and under-age, but said he had never got so drunk as to forget events.
The federal judge added that his calendars for 1982 – which he had kept – showed he had not attended a party at the location Christine Blasey Ford had described.
His friend, Mark Judge, has sent two letters to the committee saying he has no recollection of the events described by Christine Blasey Ford and adding that he had never seen Brett Kavanaugh behave in the way alleged.
The Democratic senators on the committee have called on President Trump to “immediately withdraw” Brett Kavanaugh’s nomination.
Moments after the hearing ended, however, President Trump stood by his nominee and said he found Brett Kavanaugh’s testimony “powerful, honest and riveting”.
President Trump has repeatedly defended the judge’s character, saying he is “one of the highest quality people” he has ever met.
Thousands of protesters against the nomination took to the streets on September 27 and 59 people were arrested near the Supreme Court in Washington, DC.
In a written testimony provided ahead of September 27 Senate Judiciary Committee hearing, Christine Blasey Ford says: “It is not my responsibility to determine whether Mr. Kavanaugh deserves to sit on the Supreme Court. My responsibility is to tell the truth.”
Christine Blasey Ford alleges Brett Kavanaugh tried to drunkenly remove her clothing, pinned her to a bed and groped her at a party when she was 15 and he was 17.
“Brett’s assault on me drastically altered my life. For a very long time, I was too afraid and ashamed to tell anyone the details,” she wrote in her prepared statement.
“I tried to convince myself that because Brett did not rape me, I should be able to move on and just pretend that it had never happened.”
Christine Blasey says Brett Kavanaugh and his friend Mark Judge locked her in a bedroom during a small gathering at a house in Washington DC suburbs in the summer of 1982.
“Both Brett and Mark were drunkenly laughing during the attack,” she said.
Mark Judge has disputed the allegations, saying he does not recall the incident.
“I believed [Brett Kavanaugh] was going to rape me,” Christine Blasey said. The fact that he covered her mouth she says “terrified” her the most, and has had “the most lasting impact”.
“It was hard for me to breathe, and I thought that Brett was accidentally going to kill me.”
When Mark Judge jumped on the bed, she says “we toppled over and Brett was no longer on top of me.” She was then able to run from the room.
Brett Kavanaugh is also facing other accusations of assault from three women.
However, he denies Christine Blasey Ford’s allegation “immediately, unequivocally, and categorically”.
The judge also released prepared written testimony ahead of the hearing.
Brett Kavanaugh says: “Over the past few days, other false and uncorroborated accusations have been aired. There has been a frenzy to come up with something – anything, no matter how far-fetched or odious – that will block a vote on my nomination. These are last-minute smears, pure and simple.”
The written testimony suggests Brett Kavanaugh will not try to portray himself as a saint.
He will say: “I was not perfect in those days, just as I am not perfect today. I drank beer with my friends, usually on weekends. Sometimes I had too many.”
He will also say that what he has been accused of is “far more serious than juvenile misbehavior”.
The hearing is scheduled to get under way at 10:00 local time and could last five hours.
There will be opening statements from the leading Republican and Democrat members.
Christine Blasey Ford will deliver her opening statement first.
The 21 senators on the committee will then have five minutes each to pose questions, but while the 10 Democrats are expected to ask questions themselves, it is believed a special counsel will act on behalf of the Republicans.
Christine Blasey Ford will then leave the room and Brett Kavanaugh will enter. She had earlier asked not to be in the same room as the judge.
Brett Kavanaugh will deliver his statement and the same round of questioning will follow.
President Donald Trump has portrayed the events in political terms, accusing the Democrats of trying to block the nomination.