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 
Idk dawg, a soft kevlar vest will stop a pistol round effectively by turning a penetrating injury into a blunt force injury, and they're really only useful for stopping pistol energies. A quick Google result shows the .45 ACP having a top muzzle energy of about 600 ft lbs. The .223 has a muzzle energy of 1190 ft lbs, making it almost double the energy. Even if it didn't overwhelm a bulletproof vest, there's still a decent chance it would have clobbered the fuck out of a nearly 80 year old man who probably takes blood thinners.
yeah but I don't think he's gonna die from a broken rib or punctured lung when he's got the best medics in the world airlifting him to hospital in a matter of minutes
whereas a brain shot is one and done
you can see the appeal
anyway lesson learnt rock up with the .50 BMG next time
for the curious 600 ft lbs = ~810 joules 1199 ft lbs = ~1620 joules