He hasn't made any considered calculations, its whatever is in his head at the time, he is, as a former secretary of state said "Deranged"
He is surrounded by YES "advisors" and has a level of self-awareness seen in a 6month old.
As he cannot atm stand for a 3rd term, though anything could happen, he doesn't care about the damage he is causing to allies, the global economy and his own people, who will now see increased inflation, unemployment, lower living standards... but they did vote for him, so ....
We need to cut the US free, stop our obsession with the "Special Relationship" and regain our place in Europe.... if we do not, we will fall between two stools and end up with nothing at all.
As for the state visit, Trump can fuck off!