Authors in Comparative Politics and International Relations have become increasingly interested in the domestic effects of international politics. Yet, these strands of research rarely find their way into public opinion research. According to the predominant view, attitudes toward the domestic level strongly shape attitudes toward the international level. In light of recent theoretical contributions and of recent but few empirical findings demonstrating strong effects of international (relation) factors on domestic attitudes – that is, effects ‘from the outside in’ – we question the predominant view. Instead, we argue that in times of global financial, ecological and security problems and of a very high degree of interdependence between states, international actors, politics and policies have become important enough to crucially influence the perceptions of citizens toward the domestic level. As such an influence of the international context has to be theoretically attributed to the effect of the loss of national autonomy perceived by citizens, the international context should most relevantly affect citizens’ evaluation of national political actors and the amount of trust ascribed to them. As the latter attitudes are also considered to be indicators of a systems’ legitimacy, the dependent variable of our proposal consists in public perceptions of the legitimacy of the national political system. We therefore aim for papers quantitatively but also qualitatively analyzing the effect of international actors, their behavior and their policies on public attitudes toward legitimacy on the domestic level.