I'm not a gun guy and I've been lazy (I only read the very short article) but to me it seems like a 10/10 "What the fuck were they thinking?" screw up by the Secret Service.
Sniper shot at former President Donald Trump from 130 yards away on roof of manufacturing plant
Should have aimed or something (an "AR-15 style" rifle is probably sufficient caliber to kill Trump if you hit center mass)