It's possible that Mueller and Rosenstein were part of the group that clued the Trump campaign in on the fraud. I imagine there had to be some people in government that were incensed by what they've seen but had no where to go until an honest man came along.(Trump) Time will tell and I think the time is coming soon. If this scenario gets pulled off, it'll be better than any spy movie I've ever seen.
This is just too grand a scheme. Not probable IMHO.