"It was a hard fought victory for us," said Sen. Rob Portman (R-OH). "We won everything on that child tax credit."
Meanwhile, the White House expressed satisfaction with the terms of that deal as well.
"Look, we're really proud of the work that we've done already up until this point, with Senator Rubio, already doubling the child tax credit, taking it to $2,000 per child," said White House Press Secretary Sarah Huckabee Sanders.
"Senator Rubio will be there," the President told reporters. "We're doing very well on the tax front."
In both the House and Senate, GOP vote counters were trying to make sure that enough Republicans would be on board in votes next week.
"I'm waiting to look at the whole bill," said Rep. John Faso (R-NY), one of a number of Republicans from New York, New Jersey and California who were not pleased with the impact on taxpayers who itemize deductions.
One of the hurdles was the financial juggling act going on inside the GOP bill, as Republicans were arranging time limits on certain tax changes, which would make the overall plan seem less expensive.
"We’re literally trying to squeeze about $2 trillion in tax reform into a $1.5 trillion box and that’s been a problem," said Sen. Ron Johnson (R-WI).
Meanwhile, the health issues of two Senators were also raising concerns among Republicans, as Sen. Thad Cochran (R-MS) and Sen. John McCain (R-AZ) missed every vote in the Senate this week.
With the GOP advantage only 52-48, the absence of just one of those two ailing Senators could cause problems for Republicans on tax reform, especially if more than one Republican decides to vote against the final deal.