A few thoughts on this from a trapshooter
No vest, shell or Hull bag, there are 5 stations w/ 2 shots per station. (reloads)
He’s firing the gun at a low angle, His stance is wrong for skeet ,, hes shooting it like a rifle, not a shot gun and there are no skeet houses in the photo.
The lower barrel has no choke or flush tube (odd)
Porting on one side ?
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Looking at the sat pix of the Camp David skeet range, I’d guess he’s shooting at something from the #6 station on the skeet range. Or from the #5 position for trap although I don’t see a pad for that in the Sat pix. He’s using a Browning CItori XS and only looks to have one choke in it. Perhaps a flush on the bottom?
His eye lines up in a straight line w/ the front bead. BTW, in Skeet there are 8 stations, 4 have 4 shots, the rest have two shots each with the spare as an option on first miss. Maybe he has a lackey carrying/loading removing spent hulls for him?