If you look at his face and eyes when he says it, he comes across as believable. He does not look like a Clinton not having sex with that woman, and definitely lacks the aplomb of Obama in telling lies. The length of his comments weighs in his believability as well.
Since the people with custody of the footballs are all paid by the NFL and no one is discussing the bad NFL officiating any longer, I have to wonder...
It is amazing what the last two demoncrap presidents have bestowed upon America as their legacy . . . how to face the camera and lie your tail off.