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 
a straight up 556 or 756 at that distance would probably at least break a couple of his ribs at the very best. factor in hes old. its wayy too much energy in there even with perfect armoring. not to mention you guys have easy access to both.
yall gotta be on par with your guns because shits about to go down, i mean it. we don't give enough importance to the fact they are fucking armed to the teeth and have access to everything you ever did online.
please be safe.