If RR has flipped to save his own skin Mueller has a big problem.
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Its possible but unlikely that he has. RR is a manipulative dissembler who helped set up Mueller. If he flips against him there might be some damaging blow back from Mueller that further implicates RR.
That said, RR must be holding some pretty good cards to survive this long. He seems to be able to persuade Trump for whatever reasons.
I don’t think it was Trump that had to be “persuaded”!