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 
Really depends, in the shoulder he's probably surviving but not in a good way for years, maybe the rest of his life. Just the wrong tools were employed for a high chance of success at that range.