I mean, it is incredibly rare, and all examples required someone straight-up telling him (perhaps multiple times), but every time he says something along the lines of “very few people/no one knows X” it’s clearly because he only just learned it himself. But there’s two things about that:
The first is that it’s always really basic/obvious stuff that most people do know (especially the people he’s talking to*), and someone of his (ostensible) education and social position should know. E.g. I recollect he said something, early in his administration, along the lines of, “Very few people know that South Korea is a major trading partner with the US” and I was confused because who the hell doesn’t know that? and I first realized this was his consistent tell that he himself had just been told something. (And that he had no compunction about displaying - and projecting - his ignorance about basic stuff that a serious politician, much less the actual president should absolutely know.)
The second thing is that just because Trump manages to learn something, it doesn’t mean he remembers it. Witness how, during every trip to the UK, he demonstrates some confusion about the difference between the “UK,” “Great Britain” and “England,” sometimes contextualized as something “no one talks about.” But I think he realizes this is something he really should know, especially since his mother was Scottish, so he’s a bit more restrained in how he talks about it (but he’s very clearly confused himself).
*My favorite is when, in 2017, he was talking about Lincoln to Republican Party donors:
“Great president. Most people don’t even know he was a Republican, right? Does anyone know? A lot of people don’t know that.”
Yeah, I’m sure the people quick to call themselves the “part of Lincoln” didn’t know that. I wonder if Trump has remembered it?
