FILE - In this Sept. 26, 2017, file photo, Sen. Marco Rubio, R-Fla., speaks during a news conference on Capitol Hill in Washington. Rubio will vote for his party's $1.5 trillion tax bill. That gives a major boost to the prospects that GOP leaders will be able to push their prized measure through Congress next week. The Florida lawmaker had said he'd oppose the legislation unless his colleagues made the per child tax credit more generous for low-income families. On Dec. 15, Republicans said the final legislation would do just that. (AP Photo/Pablo Martinez Monsivais, File)