🚨Historic: U.S. Senate Passes Trump Sweeping Tax Reform Bill 51-49

Watch live as the United States Senate debates the GOP tax plan. A possible vote is expected later today. This is a developing story.

LIVE: U.S. Senate Debates Ahead of POSSIBLE VOTE on GOP TAX Plan Today

LIVE NOW: TAX BILL VOTE LIVE: U.S. Senate Set to Pass Trump Reform Tax Plan LIVE SENATE TAX VOTE

Before they can get to a final passage vote, Republicans need to go through a marathon voting session known as a "vote-a-rama," where any senator can force a vote on any amendment.

Rubio-Lee child tax credit expansion defeated

A closely watched amendment from Sens. Marco Rubio (R-Fla.) and Mike Lee (R-Utah) to expand the child tax credit was defeated, after receiving criticism both from other Republicans and Democrats.

The amendment would make the child tax credit refundable to payroll taxes, and would be paid for by raising the bill's corporate tax rate from 20 percent to 20.94 percent.

Rubio and Lee have been pushing for a more robust child tax credit for years, and their efforts have been supported by first daughter and White House adviser Ivanka Trump.

A number of conservative groups, as well as the National Association for Manufacturers, opposed the amendment because it would increase the corporate rate compared to the current version of the bill.

Rubio pushed back on the criticisms of his amendment, saying it was "ridiculous" to argue that a slightly higher corporate rate would be problematic.

Senate Finance Committee ranking member Ron Wyden (D-Ore.) argued that Rubio and Lee “stop far short of meaningful relief” for many Americans with their amendment and criticized the temporary nature of their proposed expansion of the credit.

The amendment went down on a procedural vote of 29-71, with several lawmakers from both sides of the aisle siding with Rubio and Lee.

Dem amendment expanding child tax credit defeated

Sen. Sherrod Brown (D-Ohio) offered the first of two amendments expected to expand the child tax credit, but it was defeated on a procedural vote.

The amendment would increase the credit to $2,500 for children under the age of 6 and index the credit to inflation.

The amendment would be paid for by increasing the bill's corporate tax rate to 25 percent, terminating the corporate rate cut after 2027 and adjusting the top individual tax bracket. Under the current version of the bill, the corporate rate would be permanently cut from 35 percent to 20 percent.

Sens. Marco Rubio (R-Fla.) and Mike Lee (R-Utah) were expected to follow Brown in offering a separate amendment on the child tax credit. Their amendment would make the child tax credit refundable against payroll taxes and would be paid for by increasing the corporate rate to 20.94 percent.

Brown said his amendment is preferable to the Rubio-Lee amendment because it's permanent and provides more tax relief for children at "the most important time in their young lives.”

Senate Budget Committee Chairman Mike Enzi (R-Wyo.) said Brown's amendment would diminish the economic growth the bill would produce, and he raised a budget point of order on it. A motion to waive Enzi's point of order failed on a vote of 48-52.

Senate GOP defeats effort to delay bill until Monday

Republicans were scrambling to finalize their legislation throughout the day Friday, forcing senators to keep asking for an additional 30 minutes of debate while they awaited Majority Leader Mitch McConnell (R-Ky)

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