Article 57 of the Constitution of Italy originally established that the Senate of the Republic was to be elected on a regional basis by Italian citizens aged 25 or older (unlike the Chamber of the Deputies, which was elected on a national basis and by all Italian citizens aged 18 or older). No region could have less than 7 senators, except for the two smallest regions: Aosta Valley (1 senator) and Molise (2 senators). From 2006 to 2020, 6 out of 315 senators (and 12 out of 630 deputies) were elected by Italians residing abroad.
