Indicted: Watch both of Mueller's witnesses against Roger Stone

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The bombshell indictment of Trump’s longest-serving political advisor, Roger Stone, began with his “back-channel” dealings in 2016. Ari Melber breaks down his reporting on these dealings from the start, including what was revealed in “The Beat” interviews with Roger Stone himself as well as both key witnesses in the Mueller indictment: “Person 1”, Jerome Corsi and “Person 2”, Randy Credico.