Counterterrorism and Homeland Security

Insurgents and violent extremists pose a constantly evolving threat, both in the United States and globally. CSIS research provides strategic thinking on the range of efforts to counter terrorist groups and their methods across the world.

See all analysis on Counterterrorism and Homeland Security

Past Events

See all events on Counterterrorism and Homeland Security

Related Programs

Experts

Seth G. Jones

Seth G. Jones

President, Defense and Security Department; Harold Brown Chair
Daniel Byman

Daniel Byman

Director, Warfare, Irregular Threats, and Terrorism Program
Alek Jovovic

Alek Jovovic

Deputy Director, Center for the Industrial Base and Senior Fellow, Defense and Security Department
Riley McCabe

Riley McCabe

Associate Fellow, Warfare, Irregular Threats, and Terrorism Program

All Counterterrorism and Homeland Security Content

Filter by

1 - 10 of 839 results
The CommonHealth

25 Years Since the Anthrax Attacks: Where Are We Now?

This episode of The CommonHealth features a live discussion on how lessons learned from the 2001 anthrax attacks have been applied to the U.S. biodefense enterprise, and what more is needed to continue protecting Americans from deliberate biological threats.

Podcast Episode by Paul Friedrichs — October 8, 2026

The CommonHealth

Playbook or Rental? U.S. Counter-Drone Defense and the 2026 World Cup

For the 2026 World Cup, the United States built its first nationwide drone defense in months. Whether the country keeps a counter-drone playbook it can carry forward, or returns a six-week rental once the stadiums empty, is the choice it faces the morning after the final.

Commentary by Alexei Hoffman — July 15, 2026

Artificial Intelligence and the Future of Terrorism

AI will not transform terrorism overnight. Its more likely effect is subtler: lowering barriers for extremist propaganda, recruitment, disinformation, and planning while strengthening counterterrorism tools and surveillance risks.

Brief by Daniel Byman and V.S. Subrahmanian — July 10, 2026

The War May Be Ending. What Did Epic Fury Cost?

Iran war costs are estimated to be between $34 billion and $42 billion. As neither the FY 2026 defense budget nor the FY 2027 budget request includes war costs, Congress faces a major battle over paying for the war.

Report by Mark F. Cancian and Chris H. Park — June 23, 2026