Nigeria is a federal republic modelled after the United States, with executive power exercised by the President. The president is both head of state and head of the federal government; the president is elected by popular vote to a maximum of two four-year terms. The president's power is checked by a Senate and a House of Representatives, which are combined in a bicameral body called the National Assembly. The Senate is a 109-seat body with three members from each state and one from the capital region of Abuja; members are elected by popular vote to four-year terms. The House contains 360 seats, with the number of seats per state determined by population.