Normative political theory over recent decades has focused mainly on what ought to be done as far as migration policies are concerned. It faces a basic challenge, which stems from two competing, yet equally fundamental, ideals underpinning liberal democratic societies: a commitment to moral universalism and the exclusionary requirement of democracy. The objective of this special issue, ‘New Challenges in Immigration Theory’, is to provide a conceptual overview of (some) immigration theories and to highlight the challenges new streams of immigration (...) pose for normative (political) theory and liberal democratic practice. The issue will consider how to reconcile state-based exclusion with a commitment to equal moral concern for all persons, by focusing on the non-standard immigration questions that have so far been ‘neglected’ by normative political theory. In line with this objective, the issue will discuss some of the inadequacies of the dominant political theories of immigration and show how such theories can be expanded to take account of new migration challenges such as brain drain, climate migration, detention of irregular migrants and asylum seekers, rights of labour migrants, transnational networks of movement, and so on. (shrink)