31It must first be borne in mind that it is solely for the national court hearing the case, which must assume responsibility for the subsequent judicial decision, to determine, with regard to the particular aspects of the case, both the need for a preliminary ruling in order to enable it to deliver judgment and the relevance of the questions which it refers to the Court. Consequently, where the questions submitted concern the interpretation or the validity of a rule of EU law, the Court is in principle bound to give a ruling (judgment of 16 June 2015, Gauweiler and Others, C‑62/14, EU:C:2015:400, paragraph 24).
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