Trump is going further off the rails. His tweet storms and Trumper tantrums are reaching Biblical proportions. He's pissed that Denmark won't sell him Greenland and he's melting down over that. Trump is angry because the Jews won't be voting for him even though he's the chosen one who has declared himself the king of Israel.
A lot of people say that Trump is mentally ill. He's not, at least not in the classic sense. Mental illnesses can be treated or cured. What Trump and others like him have cannot be treated or cured. Trump has personality disorders for which there is no know cure. In addition to his Cluster B type personality disorders, Trump is a sociopath and sociopaths cannot be treated effectively or cured.
The other all encompassing word for Trump and people like him is asshole. Before the mental health community came up with the Cluster B traits, people like Donald Trump were referred to as assholes and they often got shit beaten out of them and deservedly so. Often a beat down would keep them in check but because Trump was sent to private schools for spoiled rich kids, those beat downs didn't happen often enough.