The Plenary Hall of the Chamber of Deputies also hosts joint sittings of the Chamber of Deputies and the Senate. When meeting in joint session, Parliament is chaired by the President of the Chamber of Deputies. Every seven years, Parliament meets in joint session to elect the President of the Republic. Three delegates from each Region of Italy (apart from Valle d'Aosta, which has only one) also participate in the vote to elect the Head of State. When in joint session, Parliament also elects one third of the members of the Constitutional Court and of the High Council of Judiciary.