“Yeah, we are” ready to act, Tennessee Senator Lamar Alexander, the chair of the Health, Education, Labor and Pensions Committee, said in an interview. But what will the action be? “We’ll let you know if we have to do it,” he said.

Senate Republican Conference Chair John Thune of South Dakota said that if the Supreme Court “give[s] us seven months to fix this, we’d love the opportunity to try to come up with a better alternative.”

Wyoming Senator John Barrasso, the leader of the efforts to write a Republican alternative, also didn’t discuss details of the fallback plan. “We’ll bring that out after the Supreme Court makes a ruling,” he told reporters.

Representative Paul Ryan, the chairman of the Ways and Means Committee, told Bloomberg that his party “will have a Republican alternative to deal with this,” but also wouldn’t offer any specifics.