I agree: the Democrats need to be pro-active about this.  The truth is they have at least two starting points: Clinton's proposals for strengthening the ACA are still on her website: https://www.hillaryclinton.com/issues/health-care/
Bernie Sanders' proposal is here: https://berniesanders.com/issues/medicare-for-all/
Trump won the presidency in large part because he never discussed the issues; no-one expected him to discuss them; few people even asked him about them. He controlled the campaign, and is trying to run the country, by saying, doing and tweeting outrageous, offensive and utterly nonsensical things. The result is the tragedy of a corrupt, incompetent, unstable president. The response to 
Trump's moral and intellectual bankruptcy must be substantive policy proposals that respond to the needs and concerns of the country. No-one can beat him at his own filthy game, and no-one should try.