He's not a dictator. We have a hardy system in America. The Executive can't simply ignore the Judiciary or the Legislature. He would abide by a court ruling whether he wants to or not; he'd have no choice. Witness the "travel ban."
U.S. Presidents have chaffed against the checks & balances system for a long time. We still have no totalitarian dictator. The Republic even survived FDR (though not unscathed). What the left screeches about Trump in this regard now, the right screeched about Obama before. It's not "the strength of the resistance to totalitarianism" that's holding back Trump; it's the American system of government, anti-totalitarian by design.