Mauricio Macri is an Argentine businessman and politician who served as the President of Argentina from 2015 to 2019. He has been the leader of the Republican Proposal (PRO) party since its founding in 2005. He previously served as 5th Chief of Government of Buenos Aires from 2007 to 2015, and was a member of the Chamber of Deputies representing Buenos Aires from 2005 to 2007. Ideologically, he identifies himself as a liberal and conservative on the Argentine centre-right.

Republican Proposal is a right-wing political party in Argentina. It is usually referred to by its abbreviation, PRO. PRO was formed as an electoral alliance in 2005, but was transformed into a national party in 2010. It is the major component of the Juntos por el Cambio coalition, and its leader is former Argentine president Mauricio Macri.