This is the thing though-
He's always been pretty dumb and incoherent, at least during his political campaign.
I recall the first few years in office, he would say crazy, incoherent shit and the response from people on his level was always-
"Thats not what he actually meant."
Remember how the term ALTERNATIVE FACTS manifested?
It makes it hard (alteast for a layperson like myself) to say, his he actually sun-downing or just exhibiting the same stupidity he always has.
Take this famous speech for example, it screams more of madness than cognitive to decline?
"“Somebody said he looks great in a bathing suit, right? And you know, when he was in the sand and he was having a hard time lifting his feet through the sand, because you know sand is heavy, they figured three solid ounces per foot, but sand is a little heavy, and he’s sitting in a bathing suit. Look, at 81, do you remember Cary Grant? How good was Cary Grant, right? I don’t think Cary Grant, he was good. I don’t know what happened to movie stars today. We used to have Cary Grant and Clark Gable and all these people. Today we have, I won’t say names, because I don’t need enemies. I don’t need enemies. I got enough enemies. But Cary Grant was, like – Michael Jackson once told me, ‘The most handsome man, Trump, in the world.’ ‘Who?’ ‘Cary Grant.’ Well, we don’t have that any more, but Cary Grant at 81 or 82, going on 100. This guy, he’s 81, going on 100. Cary Grant wouldn’t look too good in a bathing suit, either. And he was pretty good-looking, right?”"