Bernie Sanders insisted Monday he would challenge President-elect Donald Trump on issues such as repealing Obamacare but urged fellow Democrats against simply obstructing the incoming administration. “I’m going to do everything I can — and I believe I speak for virtually every member of the Democratic caucus, that we’re going to do everything that we can to improve the Affordable Care Act,” Sanders said at a town hall in Washington sponsored by CNN and moderated by Chris Cuomo.