Sen. Joe Donnelly Joseph (Joe) Simon DonnellyHarris faces pivotal moment with Supreme Court battle 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-Ind.), one of the Senate Democrats considered most likely to vote for Supreme Court nominee Brett Kavanaugh, says action on the judge should be postponed pending review of an attempted sexual assault allegation against the nominee.

“The allegations made against Judge Kavanaugh are serious and merit further review. Given the nature of these allegations, and the number of outstanding questions, I believe the Judiciary Committee should hold off on Thursday’s scheduled vote,” Donnelly said in a statement.

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Donnelly’s opposition to holding a committee vote on Kavanaugh this Thursday is significant because he was one of only three Senate Democrats to vote for Justice Neil Gorsuch, President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's first nominee to the court.

Donnelly, who is facing a tough reelection in a state that Trump won by double digits in 2016, has been seen as a possible "yes" vote on Kavanaugh along with two other Democrats who also face tough reelection races in November.

Kavanaugh appeared to be cruising to confirmation until an allegation publicly surfaced last week that he attempted to sexually assault a 15-year-old girl at the end of his junior year at Georgetown Preparatory School.