Robert Mueller, the leader of the Russian investigation, is a no-nonsense guy. But there's one investigation from 1988 that remains personal.

In the early 1990s, Robert Mueller had just left one of the most powerful posts in America's criminal justice system: assistant attorney general for the criminal division of the Department of Justice. Taking his experience into private practice, he was making well into six figures at a high-profile Washington law firm. Then he made a surprising call to Eric Holder, who was at the time the US attorney for Washington.

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