38As a preliminary point, it must, first, be recalled that the choice of legal basis for an EU measure must rest on objective factors that are amenable to judicial review; these include the aim and the content of the measure. If examination of the measure concerned reveals that it pursues a twofold purpose or that it has a twofold component and if one of those is identifiable as the main or predominant purpose or component, whereas the other is merely incidental, that measure must be founded on a single legal basis, namely that required by the main or predominant purpose or component (judgment of 3 December 2019, Czech Republic v Parliament and Council, C‑482/17, EU:C:2019:1035, paragraph 31 and the case-law cited).
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