The final Republican tax bill will increase the amount of the refundable child tax credit to $1,400, Rep. Kristi Noem Kristi Lynn NoemSouth Dakota AG issues statement on fatal crash, says 'I discovered the body' Authorities confirm South Dakota attorney general involved in fatal crash South Dakota governor defends Sturgis rallygoers: 'Exercised their personal freedom to attend' MORE (R-S.D.) told reporters Friday, as leaders seek to win the vote of Sen. Marco Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP MORE (R-Fla.).

The refundable amount was $1,100 in the Senate-passed tax bill, but Rubio on Thursday said that wasn't good enough. He has threatened to vote against the bill unless the refundable amount of the credit is increased.

It's unclear whether the change will be enough to satisfy him.

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A spokeswoman for Rubio said they had not yet seen the text of the bill, but warned that unless the percentage of the refundable credit is significantly higher, Rubio's position would remain the same.

"Can only support bill if % of the 2K #ChildTaxCredit available to #workingclass parents is increased to % meaningfully higher than 55%," Rubio tweeted Friday morning.

Members of the House-Senate conference committee are gathering Friday morning to decide whether to sign onto the conference report on the tax bill.

The text of the compromise legislation is expected to be released later Friday.