Trump's power is not unchecked. He probably doesn't even win the craziest president award.

Historical US presidents:

Andrew Jackson -> threatened to hang his VP. https://history.stackexchange.com/questions/41212/did-andrew...

https://en.wikipedia.org/wiki/Lyndon_B._Johnson had meetings while sitting on the toilet: https://historyfacts.com/famous-figures/fact/lyndon-b-johnso...

Richard Nixon - needs no introductions?

https://www.reddit.com/r/Presidents/comments/13yplux/crazies...

Also remember we had: https://en.wikipedia.org/wiki/McCarthyism and the requirement by Truman that all civil service employees be screened for "loyalty".