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Why did John Roberts intervene in Mueller probe?

Supreme Court Chief Justice John Roberts intervened in a mysterious grand jury subpoena just days before Christmas. It's supposedly linked to Robert Mueller's Russia investigation. Nelson Cunningham analyzed the subpoena in a piece for Politico Magazine. He's worked as a federal prosecutor under Rudy Giuliani and a legal aide to the Clinton administration, and he joined CBSN to discuss his findings.
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