Where is the Supposed Proof That the Russians Hacked the DNC Computers Why Not Talk to Julian Assange?

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WikiLeaks received the hacked DNC emails from the Russians according to the current team of federal investigators in charge, yet Julian Assange has always said that it was not from the Russians, so why shouldn’t he be interviewed to find-out whom he says gave the hacked emails to WikiLeaks? Some computer experts have postulated that it was an inside job, by the limited forensics availed to the public, which brings to mind Seth Rich, the supporter of Bernie who worked at the DNC and was murdered, supposedly in a robbery yet nothing was stolen except Rich’s life.