The letter also highlighted the assassination of over 50 social leaders, trade unionists, environmentalists and other community representatives in 2022. Signatories of the letter included former Ecuadorian president Rafael Correa, American linguist and philosopher Noam Chomsky and member of the French National Assembly Jean-Luc Mélenchon.[71] During the campaign, Petro received support from foreign politicians, such as former Uruguayan president José Mujica and former Spanish prime minister José Luis Rodríguez Zapatero.[72][73]