It is a bicameral body; divided into two houses; with the upper house being called the Senate while the lower house being called the National Congress. All the 500 seats are voted directly by the voting-age population. As Hani is a federal state, there are about five senators per governorate. However, the number of congressmen a governorate may have depends on its population (three seats per million people). Both houses of the Diet vote in secret ballots and follow the majority-rule voting system.