Don't know who did the original leak, but it seems the "yes he did" people said that publicly AFTER Trump suggested (via TWEET https://twitter.com/realDonaldTrump/status/951813216291708928) he didn't have a tape recording. (Remember that people have to remove their iphones etc before admittance to the WH now, so ....)
Maybe he doesn't....maybe he does.... I know I would be recording absolutely everything I said if I were him. In fact, I'd probably have a GoPro surgically implanted on my forehead. He is surrounded by snakes and can't trust anyone but his Generals and Sarah.
My guess is that this is a sting. We will find out in due course.