31It must be recalled, as a preliminary point, that the settled case-law of the Court holds 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 content of that 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 23 January 2018, Buhagiar and Others, C‑267/16, EU:C:2018:26, paragraph 41 and the case-law cited).
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