Officially Mexico has a federal form of government. The executive power belongs to the president elected by direct universal suffrage for one six-year term. The chief executive has to be not less than 35 years old, he has to live in the country within the year preceding elections, and has to be the native of Mexico. New elections are appointed in case of the president death or in case of his inability to fulfill the duties within the first two years of term. The constitution also involves the two-chamber congress: The lower house, or the Chamber of Deputies is consisted of 500 members, the Upper house, or the Senate includes 125 members. The Supreme Court is at the head of federal judicial system of the country. It consists of 21 judges who are appointed by the president to a six-year term after the consent of the senate. The Supreme Court has judicial and administrative authority over inferior courts.