The Federal Senate (Senado Federal), which has 81 seats — three members from each States and the Federal District, elected according to the principle of majority to serve eight-year terms. One-third are elected after a four-year period, and two-thirds are elected after the next four-year period; and The Chamber of Deputies (Câmara dos Deputados), which has 513 seats. Federal deputies are elected by proportional representation to serve four-year terms.