KING: Welcome back. Here's a question. Yes or no, Marco Rubio. That is the question of the hour, or at least a big question of the hour, as Republicans pass a critical deadline in their push to pass a big tax cut plan by Christmas. To vote next week, the compromise deal negotiated by Republicans needed to be signed and sealed at noon today. Senator Rubio wanted a $2,000 refundable child tax credit as part of the deal and said he would be a "no" vote unless things moved his way. CNN is now told the final deal increases that credit from $1,000 to $1,400. Is that enough to win over the Florida senator? And is that the only hurdle left? CNN's Phil Mattingly is live on Capitol Hill with the latest on the last minute edits and the arm twisting. Phil, we know the bill is done. The House Ways and Means Committee chair, Kevin Brady, just came out and talked to reporters. Is he optimistic?</s>PHIL MATTINGLY, CNN CONGRESSIONAL CORRESPONDENT: Yes, he is, John. He told us that he believes that the Senate will have the votes to pass the conference report. The House will as well. We will see the conference report tonight at 5:30. It will be nice to dig through the 503 pages of tax legislation. Look, I think it's an important point to make. The bill is close. There will be no more changes at any point. So any deal that was struck or any efforts to go towards Marco Rubio, they're done now. This needs to be enough. Now, where does he currently stand? His office says he is not coming out in any way, shape, or form as a "yes" until they see the final legislative text. And at this point, they haven't. Several GOP leadership aides, senior GOP aides, saying they feel confident that that boost from $1,100 to $1,400 is getting him in that direction, should lock him in. Senator Rob Portman also came out of signing the conference report just a short while ago, said he believed people that had problems with the child tax credit should be happy with where things are.
Republicans scramble on Tax Vote.