Trump, pushing the Senate to confirm Kavanaugh to a lifetime job on the top USA court, said on Twitter after the FBI finished its investigation that the allegations against his nominee were "totally uncorroborated".
The allegations of sexual misconduct when he was a high school and college student, which he has denied, arose during the confirmation process.
At a signal from organizers, the group began holding up signs and chanting.
Police rounded the protesters up in a Senate office building after they sat down and refused to budge.
US Capitol Police kept demonstrators at bay by forming a protective barrier around lawmakers walking through corridors.
Those not interviewed in the reopened background investigation included Kavanaugh himself and Christine Blasey Ford, who ignited the furor by alleging he'd molested her in a locked room at a 1982 high school gathering.
There was another protest in front of Trump Tower in New York City.
"I have always treated colleagues and litigants with the utmost respect".
Trudeau and Freeland Happy With NAFTA Agreement
It said the measures will have "a dramatic impact not only for dairy farmers but for the whole sector". The agreement reached Sunday gives US farmers greater access to the Canadian dairy market.
A woman from Virginia Beach shows her support for Supreme Court nominee Brett Kavanaugh on the East Front of the Capitol, as senators review the FBI's supplemental background check on him on October 4, 2018. He denied the allegation and painted himself as the victim of a "political hit".
"There's nothing in it that we didn't already know", Judiciary Chairman Chuck Grassley of Iowa said Thursday as senators are viewing the report in private.
The protesters include a loud contingent from ME, and they're calling on Susan Collins, a key Republican senator, to vote against Kavanaugh.
While the Federal Bureau of Investigation interviews were to focus on sexual assault allegations, Democrats have also called into question his drinking habits during high school and college and dishonest comments they say he has made about his background. "It looks to be a product of an incomplete investigation that was limited perhaps by the White House, I don't know", Feinstein told reporters.
The self-defence came too late for John Paul Stevens, a retired Supreme Court justice who on Thursday said he once believed Kavanaugh to be a fine judge.
Kavanaugh promised in the piece, titled "I am an independent, impartial judge", that his tone was not an indication that his open-mindedness would change if the Senate confirms him to the nation's highest court.
No Republicans have said they will vote against Mr Kavanaugh, although four have not committed to supporting him.
Senator Jeff Flake of Arizona said the findings contained "no additional corroborating information". Lisa Murkowski of Alaska and Susan Collins of Maine.
A few women who identified themselves as sexual assault survivors approached Republican Sen. In the short term he could provide the decisive fifth vote for a conservative majority on the nine-member court.
Even without locking in support, Senate majority leader Mitch McConnell pushed ahead with trying to move Trump's nominee forward in what would be an election year win for his party. After critics blasted Kavanaugh's September 27 testimony before the Senate Judiciary Committee as overtly emotional and more, even Republican Justice John Paul Stevens admitted "there's merit to that criticism", the Palm Beach Post originally reported.