When I watched this issue being brought up I wondered the same thing too. Just guessing, I would think that someone’s polling is showing Trump’s support among African Americans is better then is being let on.
A Trump surrogate should step in and say, “well you can see how anyone might think this, given the generally sparse nature of Obama’s documents, and his record of collaboration with Saudi Arabia, in fact, some might say he is little more than a Saudi agent.”
It’s called a pivot. (nuance added)