Great, this will probably dominate the news for a while and give Trump a breather after he spent the last week alienating voters. That said, while he might be able to milk this for a brief bump in the polls, I doubt it would last. He doesn’t have the ability to not loudly proclaim insane bigoted nonsense.
Hopefully this will cause him to either get overly cautious (unlikely) or become even more nuts and repulsive to anyone that isn’t a die hard loyalist already.