July 14 marks the one-year anniversary of the announcement of the Iran nuclear deal, known as the Joint Comprehensive Plan of Action (JCPOA). Since then, Iran has shown no signs of moderating its extreme behavior. It has defiantly advanced its ballistic missile program, expanded support for terrorist organizations, stepped up efforts to destabilize the Middle East, escalated involvement in regional conflicts, and increased domestic repression—all while continuing to threaten Israel and the United States. Congress must demand robust enforcement and the expansion of sanctions targeting Iran’s illicit behavior. As the past 12 months have shown, failure to hold Iran accountable will encourage further aggression.