All he has to say is that he didn't snort. I hope it is something epic! Not some bs drug crap, nobody cares about that kind of stuff(media wise).
Oh the media will have a field day with it. Criticizing Trump if there is no hard proof. If he has solid concrete proof like pictures etc. of it happening then fine, if not he should just leave it be. Trump is an attention whore and wants so bad to be the one to take down this administration that there is no telling what he might say.