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The rising number of U.S. and European citizens traveling to fight with rebel and terrorist groups in Syria and Iraq has emerged as a growing concern for U.S. and European leaders, including Members of Congress. Several deadly terrorist attacks in Europe over the past year--including the killing of 17 people in Paris in January 2015--have heightened the perception that these individuals could pose a serious security threat. Increasingly, terrorist suspects in Europe appear to have spent time with groups fighting in the Middle East, especially with the Islamic State organization (also known as ISIL or ISIS). Others, like the gunman who murdered two individuals in Copenhagen in February 2015, seem to have been inspired by Islamist extremist propaganda. U.S. intelligence suggests that more than 20,000 foreign fighters have traveled to the Syria-Iraq region, including at least 3,400 Westerners, since 2011. The vast majority of Western fighters are thought to be from Europe, although roughly 150 Americans have traveled or attempted to travel to Syria. U.S. authorities estimate that a handful of Americans have died in the conflict; they also assert that military operations against the Islamic State group since August 2014 have killed thousands of fighters, including an unknown number of foreigners. European governments have employed a mix of security measures and prevention efforts to address the potential foreign fighter threat. These have included increasing surveillance; prohibiting travel; countering terrorist recruitment and incitement to terrorism via the Internet and social media; and strengthening counter-radicalization programs. Steps are also being taken by the 28-member European Union (EU) to better combat the possible threat given the bloc's largely open internal borders (which permit individuals to travel without passport checks among most European countries). EU leaders have emphasized the need to enhance information-sharing among national and EU authorities, strengthen external border controls, and improve existing counter-radicalization efforts, particularly online. Nevertheless, European countries and the EU face a range of challenges in stemming the flow of fighters to Syria and Iraq and keeping track of those who go and return. Prosecuting such individuals is difficult in many European countries because most existing laws require a high level of proof that a suspect has actually engaged in terrorism abroad or has returned to commit a terrorist act. Due to ongoing resource constraints, even those governments with farreaching legal authority to detain terrorist suspects have found it difficult to identify and monitor a growing number of potential assailants. Furthermore, implementation of several EU-wide measures under discussion could be slowed by national sovereignty concerns, longstanding law enforcement barriers to sharing sensitive information, and strong EU data privacy and protection rights. U.S. officials and analysts contend that the potential foreign fighter threat underscores the importance of close law enforcement ties with key European allies and existing U.S.-EU information-sharing arrangements, including those related to tracking terrorist financing and sharing airline passenger data. Some U.S. policymakers, including several Members of Congress, have expressed particular worries about European fighters in Syria and Iraq because the U.S. Visa Waiver Program (VWP) permits short-term visa-free travel to the United States for citizens of most European countries. At the same time, many point out that the VWP's existing security controls require VWP travelers to provide advanced biographic information to U.S. authorities and may help limit travel by known violent extremists. In the 113th Congress, several pieces of legislation were introduced on the VWP, ranging from proposals to limit or suspend the program to those that sought to strengthen the security of the VWP further. In the 114th Congress, two proposals--H.R. 158 and S. 542--largely aim to enhance the VWP's security components to better guard against potential terrorist threats. [ABSTRACT FROM AUTHOR]