That means numerous senators ended up listening to staffers read aloud the 46-page report, which contained 11 accounts of Federal Bureau of Investigation agents' interviews with nine witnesses related to sexual assault and misconduct allegations against President Donald Trump's Supreme Court nominee.
Republicans and the White House trumpeted the fact that the investigation found no corroborating evidence to Ford's claims, while Senator Dianne Feinstein (D-California) complained that the FBI's probe was not extensive enough.
They are Democrat Joe Manchin of West Virginia and Republicans Jeff Flake of Arizona, Susan Collins of ME and Lisa Murkowski of Alaska. Flake was instrumental in getting Trump to order the FBI investigation last Friday.
With a razor thin 51-49 margin, Trump needs the vote of every Republican senator to push through his nominee.
"There is no question the Kavanaugh fight has provided a burst of energy to Republican voters at a critical time", said Brian Walsh, a Republican strategist and former staffer for the party's Senate campaign committee. One Democrat, Joe Manchin of West Virginia, who faces re-election next month in a state won easily by Mr Trump in 2016, is also wavering.
Most Democrats opposed Mr Trump's nomination of Mr Kavanaugh from the outset. At 53, he is likely to serve on the court for decades if confirmed.
One person who evidently did not was Christine Blasey Ford, the first woman who accused Kavanaugh of sexual misconduct.
At a MS election rally late Tuesday, Trump ridiculed Ford's accusation that Kavanaugh sexually assaulted her.
The FBI interviewed several people, including three who Ford has said attended a 1982 high school gathering in suburban Maryland where she says Kavanaugh's attack occurred, plus another Kavanaugh friend.
Protesters rally against Kavanaugh in the atrium of the Hart Senate Office Building in Washington on Thursday.
The letter also says Kavanaugh gave "intemperate, inflammatory" responses and was "discourteous" to senators.
The FBI is expected to soon provide senators with the results of its investigation into allegations of sexual misconduct by Kavanaugh when he was in high school and college. The report will not be made public. Senators were allowed to read it behind closed doors in a secure location in the Capitol, without taking notes or making copies.
White House spokesman Raj Shah rebuffed Democrats' complaints.
On Kavanaugh, Heitkamp told WDAY, a TV station in Fargo, "the process has been bad, but at the end of the day you have to make a decision and I've made that decision".
One Republican Senator, John Cornyn, raised eyebrows by telling his party this was "our Atticus Finch moment", a reference to the lawyer in classic novel To Kill A Mockingbird who refutes a false rape allegation. Sources tell CBS News Vice President Mike Pence will be in Washington this weekend, in case his vote is needed to break a tie.
Two Republican "no" votes could sink the nomination.
"When the noise fades, when the uncorroborated mud washes away, what's left is the distinguished nominee who stands before us".
"There's nothing in it that we didn't already know".
The U.S. Senate is poised to take a crucial vote Friday on whether to advance Brett Kavanaugh's nomination to the Supreme Court as key Republican senators remain undecided amid allegations of sexual misconduct and intense protests that have divided the nation. Kavanaugh himself has categorically denied the accusations against him, calling them "last minute smears" created to delay his nomination process further.