 Initially a member of the monarchist "Acción Española" he joined the Falange in July 1936 and was soon appointed Civil Governor of Seville.He was involved in talks with Carlists leaders in Lisbon in 1937 over merging with the Falange but the contacts failed because of his endorsement of Don Juan de Borbon as rightful heir to the throne of Spain, although subsequently Franco merged the two movements by decree.Following the establishment of the "Falange Española Tradicionalista y de las Juntas de Ofensiva Nacional-Sindicalista" later that same year Gamero was appointed to its "Junta Politica", confirming his status as the rising star of the movement.