Sen. Joe Donnelly, D-Ind., announced Friday that he will vote against Judge Brett Kavanaugh's nomination to the Supreme Court.

In a statement, Donnelly said that he would "welcome the opportunity" to work with a new nominee for the court, but that he will not vote for Kavanaugh if he reaches the Senate for a floor vote.

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“I have deep reservations about Judge Kavanaugh’s nomination to this lifetime position and, as I stated, we have been unable to get all the information necessary regarding this nomination, despite my best efforts," Donnelly said. "Only 113 people have ever served on the Supreme Court, and I believe that we must do our level best to protect its sanctity."

“While I would gladly welcome the opportunity to work with President Trump on a new nominee for this critically important position, if Judge Kavanaugh’s nomination comes before the full Senate for a vote under these circumstances, I will oppose it," Donnelly said.

Donnelly was one of three Senate Democrats who voted for Justice Neil Gorsuch, along with Sen. Joe Manchin, D-W.Va., and Sen. Heidi Heitkamp, D-N.D. Both Manchin and Heitkamp remain undecided on Kavanaugh's nomination.

Donnelly is up for re-election this year.