 Since the years of high school he became a member of the Italian Communist Party and then of the Democratic Party of the Left.After being elected in 1997 a municipal councilor of Rome, in 2001 he is named Councilor for Urban Planning by mayor Walter Veltroni, coordinating, under the guidance of Veltroni himself, the implementation of numerous interventions and public works.He is first elected deputy for the Democratic Party in 2008, and then re-elected in 2013 and 2018, dealing with the reform of urban planning legislation and the social security system.