Who is ISIS-K and how did the U.S. know to expect their attack?

The Rachel Maddow Show - A podcast by Rachel Maddow, MSNBC

Tonight's guests are Rep. Jason Crow; Marcus Yam, photojournalist for the L.A. Times; Laith Alkhouri, counterterrorism analyst; Col. Jack Jacobs; and Ryan Reilly, senior justice reporter for HuffPost.