Fmr Prosecutor: Why Mueller wants Stone for more than obstruction

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New reporting from the "Wall Street Journal” reveals Special Counsel Mueller is probing whether longtime Trump adviser Roger Stone tried to intimidate Randy Credico, a witness who is contradicting his version of events about contacts with Wikileaks. Attorney Maya Wiley tells Ari Melber she has experienced Stone’s “bullying behavior” first hand. Former Prosecutor Joyce Vance breaks down why she believes Mueller is likely pursuing Stone for more than "obstruction”.