The country is governed under the constitution of 2010. The president, who is both the head of state and the head of government, is elected by popular vote to a four-year term; there are no lifetime term limits, but an individual may not be elected to more than two terms consecutively. The legislature is the bicameral National Congress. The members of the 32-seat Senate and the 183-seat Chamber of Deputies are all directly elected for four-year terms (except for those elected in 2010, who serve for six years). Administratively, the country is divided into 31 provinces and the National District. The major parties are the conservative Social Christian Reformist party, organized by Joaquín Balaguer, the rival and social-democratic Dominican Revolutionary party, organized by Juan Bosch, and the centrist Dominican Liberation party.