While the Federal Bureau of Investigation interviews were to focus on sexual assault allegations, Democrats have also questioned Kavanaugh's drinking habits during high school and college and dishonest comments they say he has made about his background.
The timing of the vote could be complicated by Republican Senator Steve Daines, whose office said yesterday he planned to attend his daughter's wedding in Montana tomorrow, making him unavailable to cast his vote.
Thousands of mainly female demonstrators marched on Thursday through the nation's capital, starting at the appeals court where Judge Kavanaugh now presides.
Given that Republicans have a razor-thin 51-49 margin of control in the Senate, the party can potentially only afford one defection if it wants the confirm Judge Kavanaugh to the Supreme Court. "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. "It's been sent to the Senate, no White House editing".
Democrats also objected to a statement by committee Chairman Chuck Grassley, R-Iowa, who said the investigation "found no hint of misconduct". Ford told the committee she feared Kavanaugh would rape and accidentally kill her during the alleged assault when both where high school students in Maryland.
Sens. Jeff Flake and Susan Collins - two Republican key votes who are undecided - returned to the SCIF several times Thursday to review the document.
Mr Trump said the protesters and "their rage-fuelled resistance is starting to backfire at a level nobody has ever seen before". This background check is different, requested by a trio of senators who are undecided on Kavanaugh's confirmation.
Friday's vote is a procedural one to end the debate, and some fence-sitting senators could conceivably vote to advance Kavanaugh's nomination but still hold out their support ahead of a final confirmation roll call over the weekend.
Kavanaugh described his testimony as "forceful and passionate" - "because I forcefully and passionately denied the allegation against me".
Most lawmakers were tight-lipped on details with Republicans calling it a "thorough" investigation and Democrats saying not enough witnesses were interviews.
President Donald Trump, who was briefed on the findings of the report Thursday, signaled support for his nominee, decrying "harsh and unfair treatment" of Kavanaugh in an early morning tweet.
In an October 3 piece for Politico, journalist Matthew Miller stressed that Democrats needed to be aggressive and proactive in demanding a more comprehensive investigation of Kavanaugh. The report is confidential and has not been made public. In the short term he could provide the decisive fifth vote for a conservative majority on the nine-member court.
The sharply partisan battle became an intense political drama when Prof Blasey Ford and two other women emerged to accuse Judge Kavanaugh of sexual misconduct in the 1980s when he was in high school and college.
Ford, a psychology professor at Palo Alto University in California, said over four hours of testimony that a drunken Kavanaugh attacked her and tried to remove her clothing at a gathering of teenagers when he was 17 years old and she was 15 in 1982. Others who were watching on upper floors unfurled banners that said "we believe Christine Ford".