Haha. I looked up Roberts. Similar, but not fake Prez, IMO.
Certainly a modern silicone mask would do it for even folks not resembling the original BidEn.
However, he seems to me to have the basics - head shape and proportions. Just a bit o’ makeup, and voila... BidAn.
He’s an actor, and knows how to sit for an hour or whatever, to let the pros do the makeup thing.