How To Understand The New York Investigations Of, And Cases Against, Donald Trump

Rebecca Roiphe, former assistant district attorney for Manhattan, talks with Rachel Maddow about the difference between the New York attorney general and the New York district attorney, and what it means that a Justice Department prosecutor has joined the district attorney's investigation.  » Subscribe to MSNBC: http://on.msnbc.com/SubscribeTomsnbc

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