Under section 151 of the constitution, members of the House of Representative constituting at least one-fifth of the existing total Members of the house have the right to submit a vote of no-confidence of a single Minister or the Council of Ministers en masse. The National Assembly of Thailand, as the bicameral legislative branch of the government, consists of the House of Representatives and the Senate. The House of Representatives is the lower house of the National Assembly and consists of 500 members sitting for four years; 350 members are elected from a constituency basis and 150 members are elected from a party-list proportional representation. The Senate consists of 250 senators that hold a five-year term. Under section 107 of the 2017 constitution, senators are selected from professional and social groups, having the knowledge, expertise, and experience in various areas of society. Corruption Corruption has plagued Thailand for much of its modern history, with both the private and government sectors partaking in various forms of corruption. Corruption is embedded within Thai society due to its history and culture, where patronage plays a huge role and those with connections thrive. Research shows that the cost of bureaucratic corruption alone in 2018 amounted up to a 100 billion Thai baht, with state officials at various levels embezzling funds from large and small governmental projects. As of 2018, Corruption Perception Index by Transparency International has ranked Thailand as the 99th least corrupt. A year after the 2014 Thai coup d'état, the National Council for Peace and Order (NCPO) declared a war on corruption, a common mission by all military dictatorships following the numerous coup in Thailand's history. However, the junta was also entangled with various embarrassing corruption scandals itself. Foreign relations Thailand is an active participant in international and regional organizations, and maintains a particularly close and longstanding security relationship with the United States. Thailand's foreign policy includes support for ASEAN and it has developed increasingly close ties with the organisation's other members, Indonesia, Malaysia, the Philippines, Singapore, Brunei, Laos, Cambodia, Burma, and Vietnam. Thailand also attends the annual meetings held by the foreign and economic ministers of the ASEAN nations, including the inaugural East Asia Summit that was held in Kuala Lumpur in December 2005. Regional cooperation is progressing for Thailand in economic, trade, banking, political, and cultural matters. In 2003, Thailand served as an APEC host and formulated the meeting's theme: