The unicameral East Timorese parliament is the National Parliament or ''Parlamento Nacional'', the members of which are elected by popular vote to a five-year term. The number of seats can vary from a minimum of fifty-two to a maximum of sixty-five. The East Timorese constitution was modelled on that of Portugal. The country is still in the process of building its administration and governmental institutions. Government departments include the Polícia Nacional de Timor-Leste (police), East Timor Ministry for State and Internal Administration, Civil Aviation Division of Timor-Leste, and Immigration Department of Timor-Leste.