I mean... At the risk of landing on a list... Any infantry private could have landed that shot.

But if I were to do it it would be a larger round that's more resistant to the wind, capable of penetrating the light body armor the secret service wears, and from about 3 times the distance with 6x optics. There's at least a chance to E&E from that position and the likelihood of a kill shot is far higher.

He was mentally deranged. That's the sort of half-assery typical of people with mental problems.