The constitutions of a number of countries in South America have granted former presidents the right to be senator for life ("senador vitalicio"), possibly recalling the entirely unelected Senate of Simón Bolívar's theory (see Bolivar's tricameralism). Most of these countries have since excised these provisions as they are increasingly seen as antidemocratic. The Constitution of Paraguay still has such a provision. Former presidents are permitted to speak but not vote. Probably the most familiar case is that of Chilean dictator Augusto Pinochet (1998–2002) whose parliamentary immunity protected him from prosecution for human rights violations until the Chilean Supreme Court revoked it in 2000.