Victoria Marum (former House Congressional Liaison Officer for the Navy; Vice President, Cornerstone Government Affairs) talks about transatlantic counterterrorism on the battlefield, with a particular focus on tracking foreign fighters in Iraq and Syria, with John Demers (Assistant Attorney General for National Security, U.S. Department of Justice), Ambassador Nathan A. Sales (Coordinator for Counterterrorism, U.S. Department of State), Russ Travers (Deputy Director of the National Counterterrorism Center), and Wil van Gemert, Deputy Executive Director, EUROPOL.