This text analyzes and evaluates the influence of the political philosophies of Rousseau and Kant in Habermasian thought. It stresses the fundamental idea of Faktizität und Geltung, according to which there is a logical co-originality of human rights, interpreted as fundamental rights of individual liberty, and popular sovereignty, understood as political rights of participation and communication in the process of public formation opinion and will. It is argued that Habermas' critique of Rousseau and Kant is due to Habermas' project of the radicalization of democracy, to which the contributions of the two philosophers present some obstacles. Nevertheless, it may be said that, according to Habermas, the contribution of each one serves to solve the problems in the contribution of the other.
Fundamental rights; Popular sovereignty; Democracy; Autonomy