That's why President Trump nominated Rosenstein. Nothing more. Not strategic Machiavellian deep state chess nonsense. Sessions wanted him, so Trump nominated him.
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Sessions wanted Rosenstein as his Deputy AG. Trump gave Rosenstein to him.
These are not complex multidimensional strategic decisions.
These are straightforward reasons for what transpired.
Camp Rosenstein - supported by Sessions, Boente et al.
Camp McCabe - supported by Page, Baker, Lawfare et al