The legislation, offered by Sen. Ron Johnson (R-WI), one of the most politically vulnerable Senate incumbents in 2016, would maintain the federal HealthCare.gov subsidies at stake in King v. Burwell through the end of August 2017.

The bill was unveiled this week with 29 other cosponsors, including Senate Majority Leader Mitch McConnell (R-KY) and his four top deputies, Sen. John Cornyn (R-TX), John Thune (R-SD), John Barrasso (R-WY) and Roy Blunt (R-MO). Another cosponsor is Sen. Roger Wicker (R-MS), the chairman of the conference’s electoral arm.

Such a move would seek to protect the GOP from political peril in the 2016 elections when Democrats would try to blame the party for stripping subsidies — and maybe insurance coverage — from millions of Americans in three dozen states. A defeat for the Obama administration in a King ruling would likely create havoc across insurance markets and pose a huge problem for Republicans, many of whom have been pushing the Supreme Court to nix the subsidies.