I’m not a psychiatrist, but I talked with one about what looks like this AFAIK, if I understood correctly, he called it lose associations, associating things all over the place disregarding their lack of relevance.
Of course just exhibiting one symptom, doesn’t mean he is schizophrenic.
I think Trump does show some ADHD like behavior too, again I’m not a professional, but I think the problem for people with ADHD is that they forget where they came from, and Trump does seem to be able to get back to that.
But for sure, this is not a normal way to present your views. Except for a small child maybe, which fits the toddler label often associated with Trumps behavior.
So my best guess is that Trump is mentally like a child for whatever reason (Dementia most likely). Obviously besides being a malignant narcissist and pathological liar.