The ultra vires judgment of the German Constitutional Court on the debt security purchasing of the ECB system sent shockwaves throughout Europe. Some scholars see the legal framework, specifically the principle of the supremacy of the European Union in danger. This article argues that the judgment is a challenge for Luxembourg; however, there have been warning signs from the Czech Republic and Denmark that constitutional courts will not shy away from criticizing, when the ECJ oversteps its jurisdiction. The author argues that the judgment may weaken the overall normative power of the court and will assess whether a similar judgment could occur in the field of data protection and national security exceptions. The only way back to normality will be for the court to ensure it does not overstep its jurisdiction and the European Institutions unconditionally backing the ECJ in the expected upcoming conflict with the constitutional courts of Member States.