Over the last few days, the militant group ISIS has taken control of Iraqi cities, including Mosul .There are fears Baghdad could also fall into their hands. ISIS is fighting to establish an Islamic state across the region where they can impose Sharia law. Anderson takes a look at how ISIS quickly became such a dangerous organization.

Anderson discusses the ISIS threat with Ali Soufan, a former FBI agent and Philip Mudd, who is a former CIA and FBI senior official.