He can’t now after announcing it would be a woman.
Anyone remember the churn when he was picking a VP? He had the press and everyone else looking one way while he reached out and made the awesome choice of Pence. Yes, this is something of a different process because there is a lot more riding on it, but don’t discount Trump the showman here playing 3D chess in a game he has been thinking about since he was nominated. Nothing he says matters until the actual nomination happens.