MSNBC Live with Alex Witt 12/12/15

What motivated the San Bernardino attack?

Malcom Nance, Executive Director for the “Terror Asymmetrics Project” and author of “Defeating ISIS: Who They Are, How They Fight, What They Believe” joins Alex Witt to speak about the still developing details in the San Bernardino case. ... more Duration: {{video.duration.momentjs}}