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.
As the Obama administration weighs airstrikes against ISIS terrorists in Syria, officials are concerned at the jihadist group's growing strength, impressive tacticts and "uncanny" discipline. Brian Todd reports on ISIS becoming stronger and more capable.
Brian also took to Twitter to answer your questions on ISIS. Here's a recap.