One of Trump's funny idiosyncracies
is what he does with his too-small
fingers. It's the finger pinch.
[Enquirer]
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"
links:
https://drlillianglassbodylanguageblog.wordpress.com/tag/hillary-clinton/