U.S. Republican Representative Kristi Noem said on Friday that the refundable portion of an expanded child tax credit in the tax bill under negotiation on Capitol has risen to $1,400 from $1,000, an apparent bid to win support from Republican Senator Marco Rubio.

"I believe we're in a good spot and should be able to earn his support," said Noem, a member of the conference committee that is working on a final tax bill.

(Reporting by Amanda Becker; Writing by Makini Brice; Editing by Tim Ahmann)