One of Trump's funny idiosyncracies
is what he does with his too-small
fingers. It's the finger pinch.
It's as if he's crushing something in
between, if only metaphorically. It
depends on what he's saying, or
who's in his sights.
This is more about the symbolism:
Trump: "You don't like my wall? I crush your head,
and your country"
Trump: "while you were talking, I crushed your head. yup"