The remarks from Mr. Trump, who has been largely absent from the policy debate, had the ring of a threat by a president who has grown frustrated watching Republicans repeatedly try, and fail, to reach consensus on his campaign promise to immediately roll back the health law and enact a better system.
He said their constituents would exact a price for inaction â âyouâll see that at the voter booth, believe meâ â and hinted that any Republican who did not support the bid to open debate on an as-yet-determined health bill would be painted as complicit in preserving a health law passed on the basis of âa big, fat, ugly lie.â
âFor Senate Republicans, this is their chance to keep their promise,â Mr. Trump said, repeating the ârepeal and replaceâ mantra on which Republicans campaigned last fall. âThereâs been enough talk and no action; now is the time for action.â
After months of planning, debating and legislating, much of it behind closed doors, the Senate this week has reached the moment when votes will have to be cast. The big question Monday was what exactly the Senate will be voting on.
The fight on the Senate floor will unfold in stages.
First, the Senate majority leader, Mitch McConnell of Kentucky, said he would move ahead with a procedural vote on Tuesday to take up the health bill that narrowly passed the House in May. He urged his colleagues to do so.
âMany of us have waited literally years for this moment to finally arrive, and at long last, it has,â Mr. McConnell said on the Senate floor.
If that vote succeeds, the Senate would then be able to consider numerous amendments, including complete substitutes for the House bill. But it remains unclear what would take its place, and Senate Republican leaders have not said which substitute measure would be considered first.
Under one possible series of events, Mr. McConnell could quickly move to replace the House bill with an entirely new measure to repeal the Affordable Care Act without a replacement.
If that amendment vote fails, as it most likely would, he could move to replace the House bill with a version of the proposal he has been refining for weeks: to repeal the health law while also replacing it.
Senator John Cornyn of Texas, the No. 2 Senate Republican, said there would be âendless amendmentsâ if the procedural hurdle were cleared. He played down the significance of which substitute measure would come first.
âEverybody will get a vote on everything they want to vote on,â Mr. Cornyn said. He added, âWhat weâre trying to do is convince everybody that if theyâd like to get a vote on their amendment, then they need to vote to proceed to the House bill.â
Democrats were incredulous.
âWe are potentially one or two days away from a vote on a bill that would reorganize one-sixth of the American economy, impacting tens of millions of American lives, and no one knows what it is,â said Senator Chuck Schumer of New York, the Democratic leader. âItâs sort of like Alice in Wonderland around here.â
What they will vote on will not matter if senators oppose beginning debate. Mr. McConnell can lose only two Senate Republicans, now that Mr. McCain intends to be in the chamber.
Senator Susan Collins, Republican of Maine, is all but certain to vote no on the procedural vote, no matter what legislation Mr. McConnell promises to put before the chamber if the initial hurdle is cleared.
At least two other Republicans, Shelley Moore Capito of West Virginia and Lisa Murkowski of Alaska, have indicated they will not vote to proceed if Senate leaders plan to then put forth a measure to repeal the health law without providing a replacement.
While in West Virginia later on Monday, addressing the National Scout Jamboree, Mr. Trump teased the health and human services secretary, Tom Price, about whether he would be able to wrangle support from Ms. Capito and other Republicans. âHe better get them,â Mr. Trump said, smiling at Mr. Price to indicate he was joking â or at least seemed to be. âOtherwise, Iâll say, âTom, youâre fired.ââ
He then added, âYou better get Senator Capito to vote for it.â
Republican leaders are pressuring senators to go along at least with the procedural step, to bring them closer to delivering on their longtime promise of repealing the Affordable Care Act, which was adopted without any Republican votes.
âWhile disagreements remain on the best way to repeal and replace Obamacare, one thing is certain: The American people rightfully expect us to keep our promises and get the job done,â said Senator Ted Cruz, Republican of Texas, who said he would vote to begin debate.
Another complication is whether the more comprehensive of the different repeal measures that could go before the Senate â Mr. McConnellâs bill, which would also replace the health law â could be pared down because of parliamentary rules.
The repeal bill is being considered under special expedited procedures that apply to certain budget-related legislation. These rules limit debate, preclude a filibuster and allow passage with a simple majority vote. However, the rules stipulate that provisions of the bill can be removed if they would not change federal spending or revenue, or if the budgetary effects are âmerely incidentalâ to a policy objective.
The Senate parliamentarian, Elizabeth MacDonough, who serves as a sort of referee, has made a preliminary finding that a number of provisions of Mr. McConnellâs repeal-and-replace bill appear to violate Senate rules.
These provisions would, for example, cut off federal funds to Planned Parenthood for one year; prohibit the use of federal subsidies to buy insurance that includes coverage for abortions; and require people who have experienced a gap in insurance to wait six months before obtaining coverage in the individual market.
If a senator objects to any of these provisions, the presiding officer could sustain the objection, following the parliamentarianâs advice. Republicans would then need 60 votes to keep that provision in the bill â a nearly impossible threshold for any significant issue.