The presidency ages a person -- especially a presidency mired in scandals like this bucket of snakes -- but it looks like it just dropped Trump off a cliff. Luckily, so far he hasn't done anything too embarrassing on his overseas trip, but he has a really lost, bewildered look on his face, like he's just getting carted around from event to event and has no clue what he's supposed to be doing. Usually the guy's got this look of idiot-confidence on his face, but this presidency has shaken the hell out of him, I think.
He's always been mentally ill, but before he lived in a protective bubble that let him get away with it. Now he's in a different world, where he's called out on things instead of enabled, and it's wrecked that idiot-confidence he had. I think he's going to look more and more lost as this goes on.
It'd almost be sad, if Trump hadn't been such a jerk his entire life.