Senate Intel Committee Calls Julian Assange of WikiLeaks to Testify so Why Hasn’t Mueller Doesn’t Relate to Hacking?

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Robert Mueller says the Russians hacked the DNC emails then gave them to WikiLeaks to publish, yet Julian Assange says it was not Russians nor any other state actors who did the hacking given to him, so why hasn’t Mueller interviewed Assange about all this during his investigation, could it be because DNC operative Seth Rich supporting Bernie was the thief within?