Nearly 20 years have elapsed since the terrorist attacks of September 11. While U.S. counterterrorism policy has succeeded during that time in preventing attacks on the homeland, the threat posed by violent extremism has grown and evolved such that quashing it requires an entirely new approach. The willingness of global allies—including partners in the Middle East—to work with the U.S. to stem violent extremism means that, for the first time, a truly comprehensive, multilateral approach is in view.