West Virginia Sen. Joe Manchin Joseph (Joe) ManchinThe Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (D) said in a new interview that he remains undecided about Brett Kavanaugh's nomination to the Supreme Court, but bashed the judge's confirmation process as a "circus."

The key swing vote Democrat told Al Jazeera that he is looking at Kavanaugh's adult life and time in the judiciary. He added that he would decide after viewing the FBI's supplemental background investigation report into the allegations of sexual assault against the judge whether the probe's scope was sufficient. Kavanaugh has denied the allegations leveled against him by three women.

"This has been horrible. It's another circus," Manchin said, referring to the confirmation process.

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"I am looking at the gentleman as an adult from 22 to 53, 31 years of professional service. I am looking at him as a father," the senator added. "As a person in a community, how he interacts with his community. I am trying to put the human side to it."

Manchin, a red-state Democrat, is seen as a crucial vote to Republicans, who are hoping to secure one or two votes from such members of the Senate to avoid the possibility of Kavanaugh's nomination failing due to "no" votes from undecided Republicans.

Democrats hold 49 seats in the 100-member Senate, meaning that two Republicans would have to vote "no" to sink Kavanaugh's nomination even if every Democrats opposes him.

Judiciary Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyCollins says she will vote 'no' on Supreme Court nominee before election The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Gardner signals support for taking up Supreme Court nominee this year MORE (R-Iowa) said early Thursday that a copy of the FBI report was delivered to the Senate, where Republicans and Democrats will have alternating, one-hour access to the classified document.

Some Democrats have questioned the limited access to the FBI's investigation ahead of a planned vote on Kavanaugh's full nomination within days.

“Get this — one copy! For the United States Senate,” Sen. Dick Durbin Richard (Dick) Joseph DurbinTumultuous court battle upends fight for Senate McConnell focuses on confirming judicial nominees with COVID-19 talks stalled Senate Republicans signal openness to working with Biden MORE (D-Ill.), a member of the Senate Judiciary Committee said Wednesday. “That’s what we were told. And ... also that we would be given one hour for the Dems, one hour for the Republicans. Alternating."

“Bizarre, it doesn’t make any sense,” he added.

The White House issued a statement Thursday noting that it was "fully confident" Kavanaugh would be confirmed.