In elections following the Lisbon Regicide he was elected as Republican deputy, transforming himself in the National Assembly and the press into the principal paladin for the removal of the monarchy (the throne then occupied by young King Manuel II). Camacho was one of the leaders of the movement that created the conditions for the implantation of the First Portuguese Republic on 5 October 1910. In preparation for these events, Brito Camacho was an important connection between the Republican movement and segments of the Army with republican ideals. His political actions and connection with the Republican movement allowed him to mediate during the process of forming the Provisional Government that followed.