‘Overall, the volume’s most remarkable contribution is the examination of the theoretical foundations of EU legal order vis-à-vis international law from a migration law perspective, one that has been so far largely disregarded. Molnár provides a very comprehensive and detailed overview of the interactions between EU and international law in this field; in doing so he has also illuminated the topic of migration and expulsion of irregular migrants, drawing attention to the field beyond its immediate sector and attempting to draw conclusions that contribute to a more comprehensive debate on general principles of EU law.’