Insider: Why Mueller is probing a firm that 'war-gamed' meddling

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New reporting alleges a cyber expert met with senior members of the Trump campaign to pitch an election influence campaign that involved creating fake social media accounts to support Trump and disparage his opponents. A creator of the pitch, Peter Marino, speaks out, telling MSNBC Chief Legal Correspondent, Ari Melber, that such a report might have been shared with the Trump campaign to “encourage them or at least suggest the possibility” of the “effective use” of such techniques.