Al-Qaeda could benefit from the death of the Islamic State’s leader, potentially regaining its worldwide reach and influence.

Targeted operations by U.S. forces have eliminated notorious leaders of armed extremist groups, al-Qaeda’s Ayman al-Zawahiri the latest among them. But how much they disrupt these terrorist organizat…

A look at the post-9/11 war powers law that the Trump administration could use to justify conflict with Iran.

Members of Egypt’s jihadi movement played important roles in inspiring and plotting the 9/11 attacks. Egypt still struggles with some of the factors that gave rise to such extremism.