Probably not a real credible attempt.
One comment. "has no trouble at all getting a .22-caliber rifle, bringing it to the annual Bastille Day parade and nearly blowing away the President?"
Apparently the guy was standing in a crowd, pulled this .22 rifle out of a guitar case, and got off one shot from 150 or so feet away.
The only thing harder than guarding against something like this would be doing damage to your target.
Arf