Against the well-established critical rejection of rights a growing literature in the tradition of agonistic democracy asserts their emancipatory role in the struggles for social change. However, agonistic theorists, invested as they are in the idea of democratic innovation as a process of gradual ‘augmentation’ of existing rules, institutions and practices, fail to account for the ruptural capacity, and hence for the full radical potential, of rights. Using the performative approach, I develop a conception of rights claiming as a defiant (...) practice to express the ruptural dimension of certain forms of rights politics. I demonstrate how defiant rights claiming articulates immanent critique by declaring the incapacity of putative duty-bearer institutions and governments to uphold the claimed right due to structural constraints, thereby generating inevitable contradictions within the extant order and creating the necessity for an alternative one. Moreover, in order to fully capture the emancipatory potential and creative capacity of rights, this article argues for understanding certain forms of rights politics both as augmentation and rupture, taking the two to be different dimensions of the same radical democratic practice. I present the creative use of rights discourse by the Landless Workers’ Movement in Brazil and the transnational network of agrarian movements, La Via Campesina, as precisely such a combination of the practice of augmentation and defiant claims, which has led to the transformation of the right to food and land into the right to food sovereignty, demonstration of the structural embeddedness of rights violations in the existing global regime of food production and distribution, and authorisation of an alternative vision of the future. (shrink)