Niamh Nic Shuibhne
This chapter explores how the legal dimensions of Union citizenship are developing, more than 20 years after its genesis through the Maastricht Treaty. It first provides a brief overview of the current Treaty framework, and of its implementation through secondary law. The developing legal dimensions of citizenship are then examined in a more substantive sense. Two complementary case studies—the interpretation of Directive 2004/38 and the primary citizenship rights conferred by the Treaty—are presented in order to tease out the themes shaping the construction of citizenship law. The chapter concludes by reflecting on the deficiencies of citizenship when seen purely from the perspective of its legal development, especially when confronted with an intensifying migration debate that challenges the very fundamentals of free movement rights.