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Probably Rosenstein when he selected Mueller let him know that his investigation into Russian meddling was to be limited to the Trump campaign, and that if he couldn't find any, he was expected to nail Trump on something else.

At this point he could probably get his DC jury to bring charges against Donald Trump, Jr., for the meeting with the Russian lawyer, and name President Trump an "unindicted co-conspirator" for not immediately turning his son in once he learned of the meeting, and then bring a charge of obstruction of justice against President Trump for firing James Comey.