The source of the McCAbe/ Rosenstein feud is a bit mysterious, but I suspect it is related to the Carter Page FISA.
Rosenstein has said he was “mislead” and that the OIG investigation would exonerate him.
I suspect the “misleader” was McCabe who was FBI Acting Director at the time.
I don’t know how Rosenstein could say he was misled. All he had to do was read the Carter Page VISA warrant before he signed it.
FBI agent Ronald Hosko investigated Russian bribery in connection with Uranium One. Higher-ups in the FBI kept the counterintelligence aspects of Uranium One secret from him.
He thought it was just typical kickbacks and tax evasion. So The Coup organizers knew how to compartmentalize to hide reality.