A provision of Obamacare that opponents once saw as a potential loophole allowing a Republican president to unravel the law by executive order is now being used by some states to steady their shaky Obamacare markets.

Since the inception of Obamacare, “state innovation waivers,” which ostensibly provide states with some flexibility to experiment with different ways to provide healthcare for their residents, were eyed by those seeking to repeal the law. During the 2012 Republican presidential primaries, Mitt Romney repeatedly vowed that if elected, “On Day One I would issue an executive order paving the way for Obamacare waivers to all 50 states.” Early in the Trump administration, officials saw the waivers as a backup plan to ease Obamacare regulations if congressional repeal efforts were unsuccessful.