As a set of institutional norms and political beliefs liberal democracy has no serious contemporary rivals.1 But, as many have noted, there are tensions between the two elements of this compound. One of these tensions concerns freedom of movement. For liberalism, this is a very important value, and political authorities that restrict free movement must have strong reasons to do so. From a democratic perspective, the strongest one is that states must have the power to control immigration in order to maintain the conditions for self-government and equal citizenship. Immigration controls are often defended by other reasons that aim at maximizing economic utility for the destination country or at preserving its cultural homogeneity. From a liberal perspective these arguments are suspicious because of their obvious partiality or their incompatibility with a commitment to pluralism. For those who value freedom and equality and who believe that democracy is the best way to promote these values, the argument from citizenship is the most powerful one. But democratic polities that are liberal must at the same time strive toward expanding freedom of movement whenever the reasons for restricting it are attenuated. In this essay I explore how the tension could be made productive for this liberal goal by considering citizenship as an argument not only for closing borders but also for opening them. I regard the citizenship argument for controlling immigration as indeed quite strong and I will endorse it against the two main arguments for global freedom of movement, which refer to positive duties of global social justice and to negative duties of states to refrain from restricting basic liberties respectively. This controversy has been going on for quite some time,2 and it is hard to say anything new and original. Several protagonists have recently suggested sophisticated approaches that attempt to reconcile some of the conflicting values.3 I will comment on these only briefly. My main goal is to explore whether both normative defenses and critiques of immigration controls may have misconstrued the citizenship argument. Many theorists accept that a democratic conception of citizenship provides reasons for legitimate immigration control as well as for more generous admissions compared with current state practices.4 I want to take this approach a step further by showing that citizenship not only supports admission priorities within regimes of general immigration control but may also become a reason for expanding general rights and spaces of free movement beyond state borders. If my argument succeeds, then liberal and democratic norms concerning free movement can be reconciled, at least under favorable conditions and in the long run. The second section provides some empirical groundwork by demonstrating that free movement rights across international borders are currently attached to multiple citizenship in a broad sense, which exists both in a vertically nested constellation in the European Union and in horizontally overlapping constellations between states linked through migration. In the following section I suggest a typology of territorial and personal scopes of free movement rights. The fourth section considers the two arguments for global freedom of movement. The following section discusses citizenshipbased defenses of immigration control, while the sixth section shows how the same perspective supports territorial admission of specific categories of persons and general freedom of movement within regional unions of independent states. The final section discusses how these partial regimes of free movement could be expanded. Copyright