Dean Heller is confronting attacks over his votes on legislation to repeal Obamacare by touting his vote for a bill that was never supposed to become law.

The Nevada Republican, who is up for re-election in 2018 and is considered one of the most vulnerable Republicans, angered conservatives when he flip-flopped by voting against a bill that he voted for in 2015 that would have immediately gutted Obamacare without a replacement. He also faces attacks from his Democratic challenger, who says he went back on a promise to not strip healthcare away from millions of people.