"There’s a lot of interest," Senator Pat Toomey of Pennsylvania said Monday. "Those guys have done some very good work."

A number of Republicans are still pushing for changes to the bill, so the final version may evolve. It’s also subject to parliamentary challenges under the reconciliation process being used to circumvent the 60-vote threshold in the Senate. That could allow Democrats to strike provisions that take aim at Obamacare’s regulatory structure.

Last Chance

If it passed the Senate, the House would have to pass the bill without any changes. House Speaker Paul Ryan said Monday that the measure is Republicans’ last best chance to repeal Obamacare.

“We want them to pass this, we’re encouraging them to pass this,” Ryan told reporters at a news conference in Wisconsin. “It’s our best, last chance of getting repeal and replace done.”

But that won’t be easy either. The measure strives to equalize Medicaid funding between states, which means that some House Republicans from Medicaid expansion states could find it hard to support. That includes states like New York and California, which stand to lose federal funds under Graham-Cassidy. Those states have only Democratic senators, but have some GOP House members.

Another Run

In some ways, it’s remarkable that Republicans are mounting another run at repeal.

Two months ago, McConnell’s effort to pass a replacement with only Republican support suffered a spectacular defeat in the Senate. When members of the Senate health committee then began working on a bipartisan plan to shore up Obamacare, Graham and Cassidy revved up a new bid to get their GOP-only bill to the Senate floor.

Graham and Cassidy are hoping to channel the GOP’s embarrassment at failing to repeal Obamacare this summer after seven years of promising to do so. But Paul said Monday this legislation shouldn’t be treated like a “kidney stone” you pass “just to get rid of it.”