This video has an excellent analysis of Trump’s speaking style.
One thing I can add to this explanation is he has been married twice to non-native speakers.
If you spend a lot of time with non-native speakers, your sentences will tend to shorten and you will tend to emphasize important words more.
At the same time, rhetorical flourishes, complex sentences, subordinate clauses, and less common vocabulary words will tend to be left out.
American Buddhist Net 