The White House is confident Kavanaugh will be confirmed. GOP Sen. Chuck Grassley isn't.

The moment of truth is almost here for Brett Kavanaugh.

On Friday morning, White House spokeswoman Kerri Kupec said the administration is "confident" that Kavanaugh will be successfully confirmed to the Supreme Court, per CNN's Deirdre Walsh. The Senate is set to vote Friday morning on whether to move Kavanaugh's nomination along to a final vote, which would take place on Saturday. This comes after the FBI completed a supplemental background investigation into Kavanaugh due to multiple allegations of sexual misconduct, which he denies.

But not everyone shares the White House's confidence. Sen. Chuck Grassley (R-Iowa) told reporters Friday that he has no idea whether the vote will be successful. "This is one vote that we probably won't know until the votes are actually cast," he said, per CNN's Elizabeth Landers. Grassley also says he doesn't think anybody really knows what's going to happen, per Politico.

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Because Kavanaugh would be confirmed if he receives the vote of every Republican senator, all eyes are on swing Sens. Jeff Flake (R-Ariz.), Susan Collins (R-Maine), and Lisa Murkowski (R-Alaska). While none of them have said which way they are planning to vote, Flake and Collins on Thursday expressed satisfaction with the scope of the FBI's probe, leading to speculation that they'll decide in Kavanaugh's favor today.