Wolf Blitzer delivers the most important breaking news and political, international, and national security stories of the day. Tune to The Situation Room weekdays 5-6:30pm ET on CNN.
Brian Todd examines clues in the video of David Haines' execution. Do British authorities know who the executioner is?
Pamela Brown reports that a suspect in a string of killings might have been motivated by strong anti-U.S. sentiments.
Luring teenagers, smuggling or kidnapping fighters, Brian Todd looks at ISIS' methods to recruit westerners.
Are we at war with ISIS? As Michelle Kosinski reports, it depends on who you ask in the Obama administration.
With estimates about the number of ISIS fighters increasing, Jim Sciutto asks: what exactly is the U.S. up against?
Brian Todd reports on criticism of President Obama's characterization of counter-terror campaign in Yemen as "successful."
The CIA now says there are between 20,000 to 31,500 ISIS fighters operating in Iraq and Syria. CNN's Jim Sciutto reports.
The White House says it has identified ISIS targets in Syria, but not everyone is on board with the President's plan.
CNN's Wolf Blitzer talks to Sen. Ted Cruz about President Obama's handling of the growing ISIS threat.