Donald Trump finally spoke out about his son Donald Trump Jr.’s affair with Aubrey O’Day. While speaking to book author Ramin Setoodeh, who wrote a tell-all called Apprentice in Wonderland: How Donald Trump and Mark Burnett Took America Through the Looking Glass, the ex-president fessed up he did know what was happening with his eldest son and the former Danity Kane member. “When I ask Trump about O’Day’s affair with Don Jr., he takes a long pause. ‘I had heard that, actually,’ he says, blinking. ‘No, I had heard that.’ Did he know that O’Day had written a song about Don Jr.? ‘I hadn’t heard t…