This article sets out the context and effects of the decision of the Federal Constitutional Court of Germany (“CCF”) of 5 May 2020 on one of the European Central Bank’s monetary policy programmes. For the first time, the CCF openly refuses to follow a decision rendered by the Court of Justice of the European Union (“CJEU”), meaning the judgment of 11 December 2018, Case Weiss and Others, C-493/17. German constitutional judges found...