That is the former Saudi King Fahd who was in very frail health at the time of that photo.
I would have done the same thing.
Sidenote: Saudi Arabia is fiercely protective of their borders, but allow hundreds of thousands of TWC workers into their country to perform menial labor industry jobs.
Big business in Saudi.
Saudi leaders are always in frail health.
Bush did this on two separate occasions.
This wasn't curtesy. This was policy.