Chapter 2 situates the migration trilemma within a dynamic, securitarian framework. Informed by evidence gathered from cross-national public opinion surveys, media content analyses, an experiment, and original surveys of Members of the European Parliament, it evaluates the ways in which frames have influenced the course of the politics of immigration and the content of immigration policy in post-WWII Europe and the US. It underscores the considerable influence media and political elite frames have on popular attitudes regarding immigration and, indirectly, immigration and human mobility policies. The chapter’s main insight is that the way immigration is primarily framed largely determines whether the subject is salient, and when so, how it influences human mobility considerations. Its central argument is that as the public safety and national security dimensions of immigration have become more salient, liberal states have adopted more expansive and restrictive policies.