The Senate is holding a marathon amendment voting session Monday after Republicans advanced President Donald Trump's legislative agenda over the weekend. A final vote on the bill is not expected anytime soon.

A new analysis showing the legislation would be far more expensive than the House version could complicate its chances of final passage in that chamber, where fiscal hawks have said the cost must not grow.

While Sen. Susan Collins is among a handful of Republican holdouts, Sen. Angus King, an independent who caucuses with Democrats, has been a vocal opponent of the bill, which would extend tax cuts, slash funding for health insurance and food assistance and roll back clean energy incentives.