Nigerian government

Politics of Nigeria take place in a framework of a federal presidential representative democratic republic, whereby the President of Nigeria (Umaru Musa Yar'Adua) is both head of state and head of government, and of a pluriform multi-party system. Executive power is exercised by the government. Legislative power is vested in both the government and the two chambers of the legislature, the House of Representatives and the Senate. Nigerian senate is the upper chamber of the legislative house while the house of representatives is the lower house; together they make up the law-making body in Nigeria called the National Assembly. The highest judiciary arm of government in Nigeria in the form of a court is the Supreme Court of Nigeria. Nigeria also practices Baron de Montesquieu's theory of separation of powers. The National Assembly serves as a watchdog to the excesses of the executive arm of government.
See more at Wikipedia.org...