Foreign fighters remain a powerful jihadist force worth understanding.

Some reflections on de Kerchove’s tenure.

Some American law enforcement and national security officials speculate that the Taliban takeover in Afghanistan may embolden American jihadist sympathizers.

As the organizational scope of the post-9/11 armed conflict evolves, so too does the scope of military detention authority. A court’s ruling this week illustrates that it is shrinking.

In 1998, the IRS was prohibited from designating sovereign citizen nonfilers as “illegal tax protesters.” Two decades later, this provision may now be obscuring a plausible tool for identifying domestic ...

Remembering Sept. 11 and moving beyond the 9/11 era.

Newly declassified information reveals that a 2002 al-Qaeda attack in Israel was thwarted at the last minute. The plot was kept secret for nearly two decades.

The trial is a huge event worth paying attention to. 

On Aug. 26, the Islamic State in Khorasan committed two deadly attacks outside the Kabul airport. Although not new to the region, this has prompted questions about the group, its capabilities and the thr...

In several countries, repatriated Islamic State members have not been held accountable. Their treatment has sparked controversy and raises security concerns.

The current Department of Defense description of extremism prohibits the effects of a problem it does not yet define. A clear definition is needed to address extremism.