That facts could flip him. He doesn't want to stick himself to any illegal actions by Comey.
Sdthree, among others, posits the ‘fake russian document’ is an email from DWS to a Soros rep confirming that HRC would not be indicted per Lynch/Comey. If McCabe’s fingerprints are found on that email - if it exists in Comey’s raided docs/comms - that high-sec political crimes prison in PA will have to prepare the welcoming party by noon tomorrow!
Kamela Harris is off on a wild tangent. She’s a real piece of work. She’s fabricating an issue. Until somebody steps on Mueller’s toes, the question of his indepenence is irrrelevant. She is completey ignorant of the history and evolution of independent and special counsel, and as Rosenstein points out, she is ignorant of the current regulations.