U.S. Sen. Cory Booker made one last attempt to derail the nomination of Judge Brett Kavanaugh to the U.S. Supreme Court, urging his 4.1 million Twitter followers to flood the Senate switchboard in opposition.

Booker, D-N.J., issued his call to action as senators pored over a new FBI investigation into allegations of sexual assault leveled against Kavanaugh.

"The time to call your senators is now," Booker tweeted with the hashtags "Stop Kavanaugh" and "Believe Survivors."

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☎️ ☎️ ☎️#StopKavanaugh #BelieveSurvivors pic.twitter.com/vzZxbI4OVY — Cory Booker (@CoryBooker) October 4, 2018

Booker has used his perch on the Senate Judiciary Committee to oppose Kavanaugh's nomination. He praised Christine Blasey Ford, the research psychologist who said Kavanaugh sexually assaulted her while both were in high school, as "heroic" and rebuked the nominee for insisting that the allegations were a "calculated and orchestrated political hit."

On the Senate floor Thursday, Senate Majority Leader Mitch McConnell, R-Ky., confirmed that the first vote on Kavanaugh's nomination will take place on Friday.

Kavanaugh needs just 50 votes to advance, since Vice President Mike Pence can break any tie and McConnell unilaterally changed the rules to eliminate a filibuster for a Supreme Court nominee after first breaking with legislative norms and refusing consider President Barack Obama's pick of Judge Merrick Garland for a court vacancy.

McConnell called the allegations against Kavanaugh "an embarrassment to the Senate" said Democrats "let the politics of personal destruction run away ahead of the facts" because Kavanaugh is "stunningly and totally qualified for this job."

"The facts do not support the allegations leveled at Judge Kavanaugh's character," McConnell said.

Booker and the other Senate Judiciary Committee Democrats issued a statement Thursday in which they questioned how thorough the investigation really was.

"It is impossible to take this investigation seriously when so many key witnesses --including Judge Kavanaugh and Dr. Ford themselves -- were not interviewed and constraints appear to have been imposed on what was asked and who was spoken to." the senators said.

"Republicans have already declared there wasn't a 'hint' of misconduct. But based on our briefing and review of the documents, despite the obvious restrictions that were placed on the investigation, that is not true."

President Donald Trump weighed in as well.

The harsh and unfair treatment of Judge Brett Kavanaugh is having an incredible upward impact on voters. The PEOPLE get it far better than the politicians. Most importantly, this great life cannot be ruined by mean & despicable Democrats and totally uncorroborated allegations! — Donald J. Trump (@realDonaldTrump) October 4, 2018

This is now the 7th. time the FBI has investigated Judge Kavanaugh. If we made it 100, it would still not be good enough for the Obstructionist Democrats. — Donald J. Trump (@realDonaldTrump) October 4, 2018

Jonathan D. Salant may be reached at jsalant@njadvancemedia.com. Follow him on Twitter @JDSalant or on Facebook. Find NJ.com Politics on Facebook.