Been pondering "the ultimate question"….

It would have to be something that really blows the lid off and gets people to think, right?

And it would have to be something that Mr. Trump (or Sarah answering in his place) would be in position to talk about, and that the press would be easily overlooking or avoiding.

So how about this:

"Since Robert Mueller was not actually eligible to serve as head of the FBI at that time, what was the real reason that he and President Trump met before Mr. Mueller was appointed to be Special Counsel?"

(My second place guess is "Why hasn't Jeff Sessions been fired yet?", but in any case I tend to think it wouldn't be anything about Q at this time.)