In a tweet on Thursday afternoon, the American Civil Liberties Union said staffers for Nebraska Republican Ben Sasse had told activists the senator was undecided about how he will vote on Supreme Court nominee Brett Kavanaugh’s confirmation.

Sasse voted to advance Kavanaugh in the Judiciary Committee, and he has not appeared likely to vote against the nominee. When asked about the ACLU’s post on Thursday, Sasse spokesman James Wegmann told THE WEEKLY STANDARD the senator is and always has been likely to vote for Kavanaugh, but that he is waiting to finish reviewing the contents of the FBI’s supplemental background investigation into sexual assault allegations against the judge before announcing his vote.

“He has long been and remains at lean-yes,” said Wegmann. “He's spent well over 150 hours doing his homework, and he pledged to fully review the information in the new FBI report before announcing his vote. Like he said last night, he rejects the left's cynical play to use the MeToo movement for political gain.”

Sasse delivered a speech on the Senate floor late Wednesday night, in which he revealed that he had urged President Donald Trump to nominate a woman rather than a man for the seat. “Part of my argument then was that the very important #MeToo movement was also very new and that this Senate is not at all well prepared to handle potential allegations of sexual harassment and assault that might've come forward," he said.

During the rest of his speech, Sasse sounded vague notes of support for Kavanaugh.

“We're being told now that our vote isn't about a specific individual, a specific seat or specific evidence, but rather we're being told that the choice before us in this confirmation is a much broader choice about whether we do or don't care about women… Everything might not be black and white simple,” said Sasse.

“We seem to lack any awareness of the possibility that maybe, just maybe, constant, instant certainty about political battle lines might not be a good way to go forward. We might be undermining rather than building a better world for our kids.”

The Senate received the FBI’s report early Thursday morning, and senators have been slowly cycling through a secure room throughout the day to review the only copy of the documents available to members. Republicans and Democrats have fallen along partisan lines, with Republicans claiming the secret report vindicates Kavanaugh, and Democrats pushing back on the handling of the investigation, arguing that its scope should have been far more expansive.

In conducting the interviews, the FBI did not speak with Christine Blasey Ford, who alleges that Kavanaugh sexually assaulted her in high school, nor with Kavanaugh himself.

Senators will cast votes on whether to end debate on the nomination on Friday morning, teeing up a final confirmation vote for Saturday.

Instead of Sasse, the true swing votes on Kavanaugh’s confirmation include Alaska Republican Lisa Murkowski, Maine Republican Susan Collins, and West Virginia Democrat Joe Manchin. North Dakota Democrat Heidi Heitkamp, whose vote was previously up in the air, announced on Thursday that she would oppose the nomination.

Since Kavanaugh was nominated, Collins had sounded slightly more likely to vote yes than Murkowski. On Thursday Collins said she believed the FBI's work "appears to be a very thorough investigation." Meanwhile, Murkowski remained quiet when asked whether she thought the investigation was expansive enough.

For his part, Manchin reviewed the FBI report on Thursday afternoon, but he said he had not had enough time to reach any conclusions. He will return Friday morning to read more of the material before announcing his decision.