Long story short, the galactic republic was crumbling and a scientist set up a foundation of scientists and historians on some remote moon to rebuild society after it collapsed. He himself created a field he called psycho-history where he predicted future events with uncanny accuracy by using a strong understanding of how human beings in large groups react to events and projecting forward from event to event.
It all worked perfectly, for generations the secret foundation was secretly pulling strings behind the scenes guided by their all-knowing plan. Then suddenly a guy they called 'The Mule' came on the scene. He didn't follow any of the patterns they had laid out, a real wild card. Turns out he was a mutation but regardless, this one guy who was unpredictable and had his own plan made the foundation irrelevant and changed the path of the galaxy totally from what they had planned.
Like I said, Trump is 'the Mule'.
Good analogy. Trump is ‘the Mule’.
Sorry,but the Second Foundation took care of the Mule... the Mule died a natural death — his power and control neutralized.