CIA Chief on ISIS: Not Just an Organization, "It's a Phenomenon"

On the threat of ISIS, Brennan assured viewers, "We will destroy [ISIS], I have no doubt in my mind. And we have to remove the leadership that directs that organization to carry out these horrific attacks." ISIS' number one is Abu Bakr al-Baghdadi, and if he were to be killed, Brennan believes it would have an affect on the terrorist group.