Before he emerged onto the national stage as a Democratic candidate for the presidency, Pete Buttigieg was the mayor of a midwestern city. How did his seven month tour of duty in Afghanistan with the Navy inform his decision to run for office? And what does he think of the current president's lack of military experience? Find out on an all new "Headliners: Pete Buttigieg" this Sunday at 10 P.M. on MSNBC.