Under the rule of Juan Perón (1946–1955) he was a militant Justicialist, close to Eva Perón, whom he met in 1950. He joined the Peronist cause along with other Catholic intellectuals, like his friend José María Castiñeira de Dios. He then formed part of the resistance to those who ousted Perón in 1955, and was a member of the delegation that returned with Perón to Argentina after his exile in Spain, in 1973.