The vote was supposed to begin at 1:30 p.m. ET. But that's not happening.

What we know about the delay: Not much.

But here's what we've observed: Republican Sen. Jeff Flake disappeared to a back room with Democratic Sen. Chris Coons about 45 minutes ago and several other Democrats then joined them. Republicans have been cycling in and out of the room.

Sens. Grassley and Feinstein were speaking quietly. Sens. Sasse and Whitehouse were speaking quietly, too.

Several Republican members were seen huddling a few minutes ago, and Grassley was called back to talk to Flake.

Note: This would not be happening if there wasn’t something under discussion. What we don’t know is if it’s significant or not.