The key domestic policy fight of 2017 will be over Obamacare. If it is repealed, then the centerpiece of the Obama presidency will lie in ruins. If not, then President Obama will have been what he set out to be: a sort of Reagan of the left—a transformative president who will have profoundly changed the direction of the country.

If Donald Trump is the Republican nominee, he won’t win—or even wage—a fight to repeal Obama’s namesake. Trump has declared during this campaign that “single payer” heath care “works incredibly well” in Scotland. He has repeatedly indicated that, despite our nearly $20 trillion national debt, he has no real interest in tackling the entitlement spending that is bankrupting us. And when asked a few weeks ago to give his “opinion” on what “the top three functions of the United States government” are, he said one of them is “health care.”