The Middle East is undergoing an era of revolutionary change that is challenging the foreign policies of the United States and virtually all regional states. One of the most important rivalries defining the strategic landscape of the Middle East is between Iran and Saudi Arabia. The competition between these two states is long-standing, but is especially important now. This book examines how the successor presidency of Mahmoud Ahmadinejad has damaged relations in the Saudi-Iranian relationship along with the Saudi-led intervention into Bahrain.