The form of government is a democratic federative republic, with a presidential system. The president is both head of state and head of government of the Union and is elected for a four-year term, with the possibility of re-election for a second successive term. The current president is Jair Bolsonaro. The previous president, Michel Temer, replaced Dilma Rousseff after her impeachment. The President appoints the Ministers of State, who assist in government. Legislative houses in each political entity are the main source of law in Brazil. The National Congress is the Federation's bicameral legislature, consisting of the Chamber of Deputies and the Federal Senate. Judiciary authorities exercise jurisdictional duties almost exclusively. Brazil is a democracy, according to the Democracy Index 2010.