I know this has been said many times throughout the course of this long primary campaign, but if Trump is going to lose, then this will be the week it was realized.
Nah, he already walked back his position, so it's fine, and maddeningly, the media doesn't hold Trump accountable for his flip-flops the way that they do for a normal politician. The StormTrumpers will have any seed of doubt that might have been planted in their minds removed, and the media will drop it. This won't hurt him in the slightest, and if anything it'll help.