As a former Airborne Infantryman who trained on a M14 as a designated squad sniper (for a while at least), having fired in arctic, jungle and desert conditions using M16s, M4s (AR-15s are the civilan varient), 50 cals, M249s, M240s, shotguns, and some weird stuff handed to me at firing ranges, I know for a fact it is impossible to be reasonably expected to shoot a target the size of a ear from any distance farther than 5 feet away, especially if wind is involved.
Trump owns and has show weapons before (I assume he shot his weapons in NY to qualify for conceal carry). I do not believe anyone with a IQ high enough to pass a gun course will say it is a good idea to have someone target their ear from a couple of hundred meters away. A sniper trains to hit "center mass" at such a target, that means the chest. Not a puny ear. You don't target the ear, it's right next to the brain.
So no, Trump did not set this up. He was already leading in all the swing states with growing momentum. I wouldn't trust even a sniper in the President's 100 (100 top military snipers, and they tend to be women with tits cause their boobs act as stabilizing bipods) with the best gear out there. I've seen the best gear, I had to work as a slave for the Ranger's A Team (I failed to join the rangers and got drafted into slace duties for them as I awaited my new unkt orders) , seen what the most elite snipers we have use. None of that stuff will consistently target just a ear with no margin of failure. It's insane. Army basic training, as some have suggested on this site, does not even remotely give you the skillset to target a head. It's all center mass, and they don't teach you how to adjust for the wind. That's very advanced stuff only a few get high level access to. A good infantryman can hit a target at 1000 yards, and by hit I mean anywhere on the target, enough that the pop up goes down. They get to be snipers. Alot of guys struggle at just 25 yards, close enough to throw a rock at it.
These are professional infantryman. Rifle is their lives. Most people can't shoot. Mlst gun collectors have no idea how to use their weapons. I do, and I don't own a gun. Think it's a mental crutch for their short comings. And a AR-15 is a low caliber crap weapon for hunting deer (I live real close to Butler PA) and you don't buy it for hunting but rather because you seen it on movies and videogames and want to look cool. Alot of police use it merely because they recruit infantry veterans and makes mass training much easier as you're bound to have several experts trained on it day one of recruiting. But it's a crap sniper weapon. It's best for door to door fighting. People say to use it in the jungle like Vietnam but they never had leaces and little vines get stuck all through it when low crawling through a bush with it. Way better stuff to use. The sex would be a woman, her age double this guy's age, and it be a two man team, and nobody skilled enough would agree to do it because it can't be safely done.