Sounds like the sanctuary cities controversy with a different hat. Trump is right again.
If I recall correctly Trump recently visited Andrew Jackson sites in Tennessee. Those places generally have great presentations of history via placards, video, books, or knowledgeable presenters.
I imagine they were well aware of Jackson’s letter to Rev AJ Crawford in which Jackson suggests a future secession of states over slavery.
Trump might have heard all this very recently. It’s not his fault he knows more about Jackson than they do.