Attacks by home-grown and foreign extremists on major European and U.S. cities have put the world on edge. In addition, terrorists are waging an increasingly sophisticated cyberwar against their foes.
- Does closing national borders keep out would-be terrorists?
- Can we decisively defeat groups such as ISIS, al-Qaeda and Boko Haram or must we reconcile ourselves to merely limiting their impact?
- Has the West's 15-year war on terror made us any safer?
Author; Lead Policy Manager, Counterterrorism, Facebook
Director, National Counterterrorism Center
Senior International Policy Analyst, RAND Corporation
Deputy Special Presidential Envoy for the Global Coalition to Counter ISIL, U.S. State Department