A growing number of researchers within the field of security studies address the blurring line between internal and external security. Some focus on the national level while others focus on the international level and the European Union (EU). Due to the changing nature of threat perceptions since the Cold War, many scholars hold that the distinction between internal and external security is dissolving. The aim of this study is to empirically examine how internal and external security discourses are merging within the EU Common Security and Defence Policy (CSDP) and how this merge is connected to the EU identity construction. This study uses a poststructuralist approach on discourse analysis of EU policies, EU council documents and speeches of the high representatives. Furthermore, an analytical framework for analyzing the merging of internal and external security discourses from an identity perspective is constructed. This study concludes that discursively constructed ”links” between internal and external security is merging the two discourses. Finally, in a co-constitutive relationship, the internal-external security nexus and the EU security identity are (re)constructing each other.