In the Liberal Party, he formed a group with Carlos Pastore [es], R. Antonio Ramos, Efraím Cardozo, and Julio César Chaves.[2] In May 1932, as Foreign Minister and responding to Carlos Saavedra Lamas (the Argentine foreign minister)'s inquiry on Paraguayan intentions in the Chaco War, Benítez demanded that Bolivia adhered to the law of war and that the League of Nations monitored the conflict fairly.[3] In June 1934, Benítez was replaced as, like his predecessor Daniel Sánchez Bustamante, he advocated for a peaceful resolution to the conflict; he switched posts with Rogelio Ibarra,[4] remaining in Rio de Janeiro for the remainder of the conflict.[2] In October 1938, he rejected the ambassadorship to Bolivia under Félix Paiva as a part of the Liberal refusal to join Paiva's proposed coalition.[5]
In the late 1950s, he resided in Brazil. By then, he had served in various Liberal positions including national deputy, party director, and cabinet minister.[6]
Barager, Joseph R. (1959). "The Historiography of the Río de la Plata Area Since 1830". The Hispanic American Historical Review. 39 (4): 588–642. doi:10.2307/2510383. ISSN0018-2168. JSTOR2510383.