Robert Mueller's office says Paul Manafrot violated plea deal by lying to investigators
Special counsel Robert Mueller's office said Monday that former Trump campaign chairman Paul Manafort had lied to investigators from the FBI and Mueller's office, violating Manafort's plea deal. Former assistant U.S. attorney Keir Dougall joins CBSN's "Red & Blue" with a look at the "significant development" in Manafort's case.