Muellers assignment is to investigate Russian meddling in the 2016 election.
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And to prosecute any other crimes he may find in the process. That was in his mandate.
The democrats and the MSM still have not explained how it is that the Russians, with no background, experience in democratic elections, or in American elections, can offset the abilities of democrat election engineers with one and a half billion dollars and hundreds of millions of free help from the MSM. Specifically, how did the Russians know what to do that the Trump campaign could not figure out?