Never. He will be the next Emperor of the United States.
The Emperor Under The Ever Rising Sun, whom noone could ever take down, unless with an atomic bomb, just like with the last World War 2 Emperor of Japan.
(That Emperor of Japan is actually the single dictator in the world who's ever lived that some journalist has still not compared Trump to, so it's well beyond my time to do my duty and actually finish my duty on this field.
Maybe Djengis Khan is the other world dictator that Trump has still not been compared to, but just wait a few more weeks and you will see.
)