Challenging EU constitutional law: The Italian Constitutional Court's new stance on direct effect and the preliminary reference procedure

This article seeks to examine the relationship between EU law and the Italian legal order in light of the recent Italian Constitutional Court (ICC)’s jurisprudence attempting to redefine EU core principles. When fundamental rights are at stake, three assumptions are challenged: the determination of direct effect shall be a prerogative of the ECJ; EU directly effective provisions entail the disapplication of conflicting national law; judges have the discretion to refer preliminary references to the ECJ where a clarification on EU law is needed. The contribution argues that the judicial search for a balance between sovereignty and supranationality is undermined by the ICC's new resistance to the well‐established EU jurisprudence. In that respect, the paper posits that the ICC's activism is the result of an unjustified ‘argumentative self‐restraint’ of the ECJ vis‐à‐vis the evolution of EU foundational principles. © 2019 John Wiley & Sons Ltd.