At some 940-pages, the legislation is a sprawling collection of tax breaks, spending cuts and other Republican priorities, including new money for national defense and deportations.

One major sticking point for Republican fiscal hawks is the megabill's proposed $5 trillion debt ceiling increase.

The Republican-controlled U.S. Senate advanced President Donald Trump's sweeping tax-cut and spending bill in a key procedural vote on Saturday, raising the odds that lawmakers will be able to pass the legislation in coming days.