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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."
National Security Advisor Susan Rice responds to James Foley's mother, who questioned the efforts to bring her son home.
The CIA now says there are between 20,000 to 31,500 ISIS fighters operating in Iraq and Syria. CNN's Jim Sciutto reports.
After the President outlined his plan to cripple ISIS, some members of Congress say they disagree with the strategy.
The White House says it has identified ISIS targets in Syria, but not everyone is on board with the President's plan.