/http%3A%2F%2Fmedia1.s-nbcnews.com%2Fj%2FMSNBC%2FComponents%2FVideo%2F__NEW%2Fn_maddow_3source_130516.standard.jpg)
Exposure of double agent at heart of AP investigation
video.msnbc.msn.com
Video on msnbc.com: Richard Engel, NBC News chief foreign correspondent, talks with Rachel Maddow about why the U.S. government is so keen to find the source of the leak to the AP about the al Qaeda bomb plot, and the rare and valuable al Qaeda double agent whose life was put at risk by their report...