Also, while it seems such an order is legal - should it be?
If these were legally obtained photos, why should someone be compelled to delete them? Compelled deletion is a slippery slope. Shared a legally purchased mp3 with a friend? Delete it. Shared a picture of Beyonce at the Superbowl? Delete it.
Is that a concession? I don't think he actually wants to be president anymore.
Don't get me wrong, it's the correct "deal" to make - it's the most overt declaration he can make to those who claim he wants to be dictator for life - I just think it's probably a win/win for him.