Italy has a parliamentary government based on a proportional voting system. The parliament is perfectly bicameral: the two houses, the Chamber of Deputies (that meets in Palazzo Montecitorio) and the Senate of the Republic (that meets in Palazzo Madama), have the same powers. The Prime Minister, officially President of the Council of Ministers (Presidente del Consiglio dei Ministri), is Italy's head of government. The Prime Minister and the cabinet are appointed by the President of the Republic, but must pass a vote of confidence in Parliament to come into office. The incumbent Prime Minister is Matteo Renzi of the Democratic Party.