6 invasion of Iraq toppled Saddam Hussein. Losing Mr. Mubarak means that the Saudis now see themselves as the last Sunni giant left in the region. The Saudis were further agitated when the protests crept closer to their own borders. In Yemen, on their southern flank, young protesters were suddenly rallying thousands, and then tens of thousands, of their fellow citizens to demand the ouster of the regime, led by President Ali Abdullah Saleh and his family for 43 years. Meanwhile, across a narrow expanse of water on Saudi Arabia's northeast border, protesters in Bahrain rallied in the hundreds of thousands around a central roundabout in Manama. Most Bahraini demonstrators were Shiites with a long list of grievances over widespread economic and political discrimination. But some Sunnis also participated, demanding more say in a government dominated by the Al-Khalifa family since the 18th century. Protesters deny that their goals had anything to do with gaining sectarian advantage. Independent observers, including the U.S. government, saw no sign that the protests were anything but homegrown movements arising from local problems. During a visit to Bahrain, Secretary of Defense Robert Gates urged the government to adopt genuine political and social reform. But to the Saudis, the rising disorder on their borders fit a pattern of Iranian meddling. A year earlier, they were convinced that Iran was stoking a rebellion in Yemen's north among a Shiite-dominated rebel group known as the Houthis. Few outside observers saw extensive ties between Iran and the Houthis. But the Saudis nonetheless viewed the nationwide Yemeni protests in that context. In Bahrain, where many Shiites openly nurture cultural and religious ties to Iran, the Saudis saw the case as even more open-and-shut. To their ears, these suspicions were confirmed when many Bahraini protesters moved beyond demands for greater political and economic participation and HOUSE_OVERSIGHT_023463