re: #4 NO SMOCKING GUN!

He has spent over $400 million!

Then he should definitely be on stage. And the other candidates will need to be ready to respond to:
Host: Mayor Bloomberg, you were a big proponent of stop and frisk as mayor. Shouldn’t people be wary of you advocating for something similar as president?
Bloomberg: Well, we have to remove Trump from office, and I’m the only one talking about that.