The kingdom of Saudi Arabia, ruled by the Al Saud family since its founding in 1932, wields significant global influence through its administration of the birthplace of the Islamic faith and by virtue of its large oil reserves. Close U.S.-Saudi official relations have survived a series of challenges since the 1940s. In recent years, shared concerns over Sunni Islamist extremist terrorism and Iranian government policies have provided some renewed logic for continued strategic cooperation. Political upheaval and conflict in the Middle East and North Africa have created new challenges, and the Trump Administration is seeking to strengthen U.S. ties to Saudi leaders as the kingdom implements a series of new domestic and foreign policy initiatives. Successive U.S. Administrations have referred to the Saudi government as an important partner, and U.S. arms sales and related security cooperation programs have continued with congressional oversight and amid some congressional opposition. Since 2009, the executive branch has notified Congress of proposed sales to Saudi Arabia of major defense articles and services with a potential aggregate value of more than $136 billion. The United States and Saudi Arabia concluded formal arms sale agreements worth more than $65 billion, from FY2009 through FY2016. Since 2015, the U.S.-trained Saudi military has used U.S.-origin weaponry, U.S. logistical assistance, and shared intelligence in support of military operations in Yemen. Some in Congress express concern about Saudi use of U.S.-origin weaponry and question Saudi commitment to combating extremism. Legislation before the 115th Congress would place conditions on or disapprove of some proposed U.S. weapons sales or otherwise limit the use of funds for some U.S. involvement in Yemen (H.J.Res. 102, H.J.Res. 104, S.J.Res. 40, S.J.Res. 42, H.R. 2810). U.S. officials praise Saudi counterterrorism efforts, including action against the Islamic State. In parallel to close security ties, official U.S. concerns about human rights and religious freedom in the kingdom have in part reflected deeper concerns for the kingdom's stability. Saudi activists advance limited economic and political reform demands, continuing trends that have seen Saudi liberals, moderates, and conservatives press for domestic change for decades. While some limited protests have occurred since unrest swept the wider region in 2011, clashes involving Saudi security forces have not spread beyond certain predominantly Shia areas of the oil-rich Eastern Province. The Obama Administration endorsed Saudi citizens' rights to free assembly and free expression. Saudi leaders reject foreign interference in the country's internal affairs. The death of King Abdullah bin Abd al Aziz in January 2015 brought to a close his long chapter of national leadership. His half-brother King Salman bin Abd al Aziz assumed the throne and has moved to assert his authority at home and pursue Saudi prerogatives abroad. Succession arrangements have attracted particular attention in recent years, as senior leaders in the royal family have passed away or faced reported health issues. A series of appointments and reassignments since 2015 has altered the responsibilities and relative power of leading members of the next generation of the Al Saud family, the grandsons of the kingdom's founder. Crown Prince Mohammed bin Salman has emerged as a central figure in Saudi policymaking, having asserted control over national security forces, proposed bold economic and social changes, and arrested prominent figures accused of corruption, including some fellow royal family members.