If you hit Donald Trump with any sniper rifle calibre from 150 m distance ANYWHERE on his body, the man’s toast. He’s a 80 year old jellybean, held together by his personal BigMac/Adrenochrome mix.
But the dude likely played too much COD or CS and simply got convinced that Trump has too much HP and you need to go for the headshot. Motherfucking 
There’s a history to headshots as a cultural object that’s kind of interesting. They rose to prominence when the mainstream culture’s perception of the “self” shifted from the heart to the brain, and art correspondingly shifted from portraying chest wounds as instantly fatal to portraying head wounds as such. I would posit that there was a corresponding material shift as well, as weapons became more accurate and more able to kill outright rather than indirectly through infection and shock, the depictions of their effects changed in turn.
This was a bit before video games were invented.