When the debate wraps up, there's a final vote, which Republicans believe will pass the bill. After that, Trump signs it into law. The bill contains much of the president's signature policies, and he's keen to sign it.

President Donald Trump celebrated the Senate's advancement of the "One Big Beautiful Bill" and acknowledged earlier holdouts -- Sens. Rick Scott, Ron Johnson, Mike Lee and Cynthia Lummis -- for casting their votes in favor of the bill in social media posts early Sunday.

The GOP tax bill is deeply unpopular, but Republicans still have an opportunity to influence public perception because many Americans know little about it.