The ability of European nation-states to control migration has been at the forefront of the immigration debate. Some scholars have argued that international human rights and the freedom of circulation required by a global economy and regional markets are the two sides of a liberal regime that undermine the sovereignty of nation-states. Others have gone even further and declared the double closure of territorial sovereignty and national citizenship to be outmoded concepts. This article inscribes itself in that debate by answering the following questions: (a) To what extent do international legal instruments constrain the actions of national policy makers? and (b) How have nation-states reacted to international constraints and problems of policy implementation? Focusing on Council of Europe's jurisprudence, the authors assess the extent to which national courts have incorporated European norms and governments take them into account. The article examines ways that national policy makers have responded by shi...