"Seriously? He's there by choice. It's their "house" and their rules. You need more downvotes."
Actually it's a significantly more than their "house" - legally it's their country, their rules - I do agree with you regarding down votes.
His visitors need to remember they are not visiting him in someone's office, they are effectively traveling to another country to make the visit and that country can pretty much impose whatever rules they like at their border crossing (front door).