In 1932, during his second period of governor, he provoked controversy by recommending the use of birth control. American Catholics were much more disturbed by this and raised many objections than did Puerto Ricans, who mostly ignored his comments. Soon after taking office, he had to deal with agitation resulting from charges made by Pedro Albizu Campos, president of the Nationalist Party, that Cornelius Rhoads, an American medical researcher with the Rockefeller Foundation, had been working on a United States plot to exterminate Puerto Ricans, based on Rhoads' own letter that became public. He ordered an investigation by the Attorney General José Ramón Quiñones, who found no evidence of wrongdoing by Rhoads of the American health project.