He shows symptoms of Narcissistic Personality Disorder to which one could add dementia. He doesn't want to govern, he wants to rule.
He worships dictators like Putin and Li'l Kin and lusts for the absolute power and control they have. The Republicans in Congress better mobilize because there are no guarantees that he won't come after any of them if they do anything that will incur his wrath.
And I fear that he might be planning to throw Ukraine under the bus. Because TACO. And with his recklessness he could throw our economy under it too.