“There are no administrative fixes that are realistic,” said Neera Tanden, president of the liberal Center for American Progress. “We don’t believe there’s any administrative fix.”

The high court is expected to rule this summer in a lawsuit over Obamacare’s insurance subsidies, which more than 80 percent of enrollees are receiving. The challengers argue that the Affordable Care Act only authorizes subsidies in states that set up their own insurance exchanges–not in the 36 states that punted the task to the federal government.

A ruling in the challengers’ favor would devastate Obamacare–millions of people could lose their coverage–and could wreak havoc on the non-Obamacare insurance markets in those 36 states. The repercussions would be severe enough to demand a fix. But a fix would be hard to come by.