Although I am not a medical expert, the signs are becoming so clear that anyone can see it: Donald Trump is senile. He is confused and disoriented, he is losing words, struggling with simple motor skills, like his failure to perform the collective arms-crossed handshake during his Asia trip, or him having to use both hands to take a sip of water. The man was a moron before, but now he's an idiot.
It's not even appropriate to use the phrase "the lights are on, but there's nobody home". With Donald Trump, the lights are out, and on the increasingly rare occasions when there happens to be someone home, he is fumbling in the dark, lost and without aim, and with no sense of direction.