I don't understand how you can describe Trump as a dictator.
Aside from the fact that he was democratically elected via universal suffrage, as President of the USA he actually has less power to act without approval of Congress than, say, the British Prime Minister has to act without the approval of Parliament.
Okay so on paper he controls the strategic nuclear arsenal. But in practice he doesn't. He cannot just wake up in a bad mood one morning and nuke the world.