Watch: Jon Stewart and Barack Obama trade barbs over nuclear deal
Obama and Stewart sat down for a lengthy conversation, beginning with Iran, for their last on-air exchange before Stewart's expected retirement in August.
US President Barack Obama makes an appearance on The Daily Show with Jon Stewart in New York July 21, 2015. (photo credit: MARC ISRAEL SELLEM/THE JERUSALEM POST)ByDANIEL J. ROTHUpdated: