This CSIS report states that terrorism is no longer the leading international threat to the United States or its top defense priority, but challenges related to violent extremism remain. The threat from Salafi-jihadist groups such as al Qaeda and the Islamic State has declined, and ethnonationalist threats are largely contained. However, a broader patchwork of violent far-left extremist ideologies has become more prominent on the global stage.

Catrina Doxsee is a fellow with the Transnational Threats Project at the Center for Strategic and International Studies (CSIS).

Alexander Palmer is an associate fellow in the Transnational Threats Project at CSIS.

Riley McCabe is a program manager and research associate for the Transnational Threats Project at CSIS.