Senate Judiciary Committee Chairman Chuck Grassley, R-Iowa, said he has no idea how a key vote will go on Friday morning for Supreme Court nominee Brett Kavanaugh.

"As of now, I don't really know, and I don't know whether anybody else does," he said on Fox News.

He's referring to three Republican senators who are undecided, and have yet to say how they'll vote.

Sens. Jeff Flake of Arizona, Susan Collins of Maine, and Lisa Murkowski of Alaska. They called for a one-week pause in the nomination in order to give the FBI more time to investigate sexual assault claims against Kavanaugh.

Grassley said he can live with the senators' indecision because it's one that should be made carefully.

"I think that they want legitimately, and I found myself in the same position, you want to make sure before you make a final decision," he said. "You want your constituents to know that you're very thoughtful about it."

"I've been in that same position, so I'm not going to hold it against them for not announcing ahead of time," Grassley added.

Grassley and other Republican leaders said when the report came in Thursday, it included no new corroboration of those claims, and said Kavanaugh should be confirmed.

Flake and Collins signaled Thursday that they had no immediate problem with the FBI report, but hadn't said even as of Friday morning how they would vote.

The Senate clocks in at 9:30 a.m., and it set to start voting on whether to end debate on Kavanaugh's nomination at 10:30 a.m.

With 51 GOP votes in the Senate, Republicans can only lose one vote and still advance Kavanaugh to a final vote on his confirmation.

Grassley also criticized some Democrats for encouraging violent protests against Republicans during the Kavanaugh nomination process.

"I think that it's a reflection of the incivility of American society generally, and I think it's also evidence that people will go to any length when they're encouraged by people on Capitol Hill," Grassley said.

"We as senators... ought to be setting an example for civility, not encouraging incivility," he said.