The public story isn’t that far developed, as the FBI informant still hasn’t testified that we know of. But we do know that Mueller, McCabe and Rosenstein were responsible for the investigation, and the uranium sale still went through, which is reason enough to question why they are now given the ultimate responsibilty to investigate the President. At least for most people here, although we do have our share still defending them for some reason.
What I DO know is that Rosenstein was appointed by President Trump long after everything related to the Uranium One case took place. He hasn't been fired yet, and if he does get fired it will surely be for a damn good reason.