washington senior white house adviser say thursday congress would need end obamacare mandate tax part propose short-term deal stabilize health insurance market order president donald trump sign gist believe individual mandate repeal employer mandate repeal allow americans contribute health save account white house legislative affairs director marc short tell cnn really want reduce price need begin repeal obamacare mandate repeal tax could deal short say say administration send list principles would like see legislation bill co-author would likely make public white house say want obamacare mandate tax end health deal