Trump is playing defense. He is adopting a defensive strategy.
Defense is a losers' game. Its only utility is to prevent advancement of the opposition.
Do you actually read what you write?
Sun Tzu's — Art of War "Attack is the secret of defense; defense is the planning of an attack." It would be hard to find a better epitome of the root principle of war.
How is trying to stop Hillary from advancing right now, not playing defense?
I am looking for a candidate who will advance conservatism. What are you looking for?