50Accordingly, as, in essence, the Advocate General noted in point 66 of his Opinion, the obligation imposed on a Union citizen to have sufficient resources for him or herself and his or her family member who is a third-country national, is such as to undermine the effectiveness of Article 20 TFEU if it results in that citizen having to leave the territory of the European Union as a whole and, by reason of the existence of a relationship of dependency between that national and the Union citizen, the latter is, in fact, obliged to accompany him or her and, consequently, also to leave the territory of the European Union.
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