78In that regard, it should be stated that, by virtue of the principle of primacy of EU law, which is an essential feature of the EU legal order, rules of national law, even of a constitutional order, cannot be allowed to undermine the effectiveness of EU law in the territory of that State (judgment of 26 February 2013, Melloni, C‑399/11, EU:C:2013:107, paragraph 59).
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