At the same time, Republican leaders seemed to show increasing confidence.
Trump, himself accused by numerous women during the 2016 presidential race of sexual misconduct, wrote on Twitter that the Federal Bureau of Investigation report showed that the allegations against Kavanaugh were "totally uncorroborated".
Who else didn't talk with investigators?
SHAPIRO: So there's a Republican accusing Democrats of a search-and-destroy mission against Judge Kavanaugh.
The Trump era has, at times, been uncomfortable for Republican women, especially the six senators who will be asked to vote for Brett Kavanaugh's Supreme Court confirmation by week's end. None of the allegations have been corroborated by the seventh FBI investigation. "But we likely never will know, given that your agents were barred from investigating", Pittard said. "There's nothing in it that we didn't already know", Grassley said in a statement.
And in this particular case, there's a strong feeling up here that Republicans or that Democrats simply decided this was going to be a search-and-destroy mission from day one.
As of late Thursday, some key senators were mum about whether or not they would vote in favor of Kavanaugh.More news: Trump has sharp words for ABC’s Vega, CNN’s Collins
Top Democrats fired back after getting their own briefing.
She said the report was "very limited" and "it looks to be a product of an incomplete investigation".
The Senate, where Republicans hold a slim 51-49 majority, could vote as early as Saturday and all eyes are on three key Republican senators who could make or break the nomination - Jeff Flake of Arizona, Susan Collins of ME, and Lisa Murkowski of Alaska.
"There is significant evidence that there are other relevant witnesses that have not been contacted, not been interviewed".
The FBI has finished an interview with Chris Garrett, a high school friend of Kavanaugh.
The senator cited Christine Blasey Ford, who accused Kavanaugh of sexually assaulting her in the early 1980s, in her statement, saying, "When I listened to Dr. Ford testify, I heard the voices of women I have known throughout my life who have similar stories of sexual assault and abuse".
Kavanaugh says that accusation is false. He provided no specifics.
The Senate majority leader also said, since there was no corroboration of the allegations, Democrats are now focusing on how Kavanaugh defended himself in his testimony. "That's the only thing I remember".More news: Kavanaugh's Yale classmate speaks out about past behavior
The White House denied that Trump had derided the university professor. Flake said he saw no additional corroborating information against Kavanaugh, although he was "still reading" it. "From his record against women's health and autonomy to his record against workplace protections to the sexual assault allegations against him to the anger he displayed to female US senators".
Swarms of anti-Kavanaugh activists attempted to thwart the selection of Trump's preferred appointment by voicing their outrage, brandishing placards with slogans such as: "I believe survivors" and "unfit to serve".
Trump weighed in hours later in a tweet in which he denounced what he called "the harsh and unfair treatment" of Kavanaugh.
The President took to Twitter Thursday to blast the "totally uncorroborated allegations!"
Senators delayed a vote on Kavanaugh so the FBI could conduct a background investigation into the allegations of sexual misconduct against him.
"They're so swamped", she said.
With Mr Kavanaugh's uncertain prospects for approval depending in part on the decisions of five wavering senators, politicians began viewing the document in a secure room in the Capitol complex.
Feeding the anxiety was an unusually beefy presence of the U.S. Capitol Police, who were keeping demonstrators and frequently reporters at arm's length by forming wedges around lawmakers walking through corridors.
The FBI report was not released to the public.More news: Amazon raises pay for hundreds of workers in Peterborough
Ford, now a California psychology professor, has testified that when the drunken Kavanaugh attacked her, she believed he was trying to rape her.