The Czech Republic is a pluralist multi-party semi-presidential representative democracy. The Parliament (''Parlament České republiky'') is bicameral, with the Chamber of Deputies (, 200 members) and the Senate (, 81 members). The members of the Chamber of Deputies are elected for a four-year term by proportional representation, with a 5% election threshold. There are 14 voting districts, identical to the country's administrative regions. The Chamber of Deputies, the successor to the Czech National Council, has the powers and responsibilities of the now defunct federal parliament of the former Czechoslovakia. The members of the Senate are elected in single-seat constituencies by two-round runoff voting for a six-year term, with one-third elected every even year in the autumn. This arrangement is modeled on the U.S. Senate, but each constituency is roughly the same size and the voting system used is a two-round runoff.