This study analyzes Hungary’s behaviour and reduced involvement in the European Union’s Common Migration and Asylum Policy. The aim of this study is to address two research questions. The first one concerns whether Hungary’s handling of the common policy area can be explained through the international relations theories of liberalism and realism. The second question examines whether the European Union is affected as an organization by this phenomenon. This thesis is a case study, and the method is a qualitative critical text analysis. The study uses cases from the European Court of Justice as its primary material. The results show that Hungary has deliberately acted based on self-interest and intensified its nationalist ideology. The finding suggest that the European Union may face reduced legitimacy and credibility. By applying the theories in the analysis, the study provides a comprehensive understanding and contributes to further research in the area.