"Once taboos are broken, it's quite hard to reinstate them".A German court ruling challenging the primacy of European Court of Justice in EU matters poses a threat to the EU that even it can't fudge. The case hinged on the right of the European Central Bank to engage in bond-buying to support the EU economy. The top German court has ruled that the ECB hasn't sufficiently explained why the measures are necessary. But more importantly, it also ruled that its view is supreme over the ruling of the top European court, the ECJ. Among other problems, this could undermine attempts to rein in member states like Poland and Hungary that are challenging the EU's political norms. To explain how the ruling does this and why it matters, Hugh talks to Ronan McCrea, professor of constitutional and European law at University College London.

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