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Sen. Marco Rubio (R-Fla.) said on Thursday he will not support the latest version of the GOP tax bill if the legislation doesn't include a larger child tax credit.

“Senator Rubio has consistently communicated to the Senate tax negotiators that his vote on final passage would depend on whether the refundability of the child tax credit was increased in a meaningful way,” said Rubio spokeswoman Olivia Perez-Cubas.

Sen. Mike Lee (R-Utah) is also "undecided" on the bill in its current form, according to a spokesman.

GOP pollster Lee Carter pointed out on "Your World" that Rubio has long said that he wants the refundable portion of the child tax credit to be more than the $1,100 it is in the current version of the tax bill.

"I think that Rubio is trying right now to be a hero for the middle class," Carter said. "He's wanting to say, 'Listen, I'm putting my stake in the ground, and I'm making this about the middle class.'"

She said she still has confidence that they will find a way to make a deal and get tax reform done.

"At the end of the day, these guys are committed to getting it done. Rubio is really putting it out there because he's not going to mess around with this tax credit. I think they can get it done tonight," Carter said.

Neil Cavuto noted that the markets took a dive as soon as Rubio signaled that he is a "no" on the tax bill in its current form.

"If that doesn't remind you that this market is propelled or not based on the prospect of tax cuts, I guess nothing will," Cavuto said.

Carter agreed, saying that Republicans have the momentum and they've got to get a deal done.

Watch more above.

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