WASHINGTON– U.S. Senate Republicans on Thursday hurtled toward a late-night showdown over a stripped-down bill to unravel Obamacare after failing to pass broader legislation to cap their seven-year quest to gut a law that brought healthcare coverage to millions.

While Republican leaders hoped their so-called skinny bill can draw the votes needed for passage over unified Democratic opposition, they still had not unveiled its text as they headed toward an expected marathon succession of votes that promises to drag into early Friday morning.

No. 2 Senate Republican John Cornyn said his party was working on a plan to repeal Obamacare’s mandate that Americans obtain health insurance or face a fine, as well as a partial repeal of the mandate that requires businesses to offer healthcare coverage to employees.

On the Senate floor, Cornyn said the bill will be called the Freedom to Choose plan, but gave few specifics. As outlined by Cornyn, the plan would repeal a few key provisions of the Affordable Care Act.

On Twitter, President Trump wrote: “Come on Republican Senators, you can do it on Healthcare. After 7 years, this is your chance to shine! Don’t let the American people down!”

In a bit of political gamesmanship apparently intended to embarrass liberal Democrats who advocate a so-called single-payer, government-run healthcare system, Senate Majority leader Mitch McConnell had the Senate vote on a plan offered by Republican Steve Daines to create such a system even though Daines and other Republicans oppose the concept.

Democrats did not take the bait, and the measure lost 57-0, with 43 Democrats voting “present” rather than yes or no.

The Senate on Wednesday rejected a simple repeal of Obamacare, with a two-year delay so Congress could devise a replacement. On Tuesday, senators rejected the broad repeal-and-replace plan Republicans had worked on since May.