until the day trump pulls, and wins, on a dementia defense, biographers have reported that many close to trump believes that he intentionally lies, and often truly believes his own false claims. sometimes on the same topic, but not at the same time.
and it's clear that he is stupendously ignorant regarding the basics of many topics AND has no interest in their facts.


"Michael Wolff’s Fire and Fury, for example, portrayed Trump as having poor command of facts and relying heavily on an immediate, emotionally satisfying version of events. Other biographers, including Michael D’Antonio and Timothy O’Brien, have emphasized that exaggeration is also a long-established business and branding technique for him—not merely a symptom of confusion."
PolitiFact

if judged outside of scotus making potus excuses, he is very much liable, but can interminably delay justice on a per claim case. and that is how amerika likes it.