Judgment_paragraph 38 · X v Udlændinge- og Integrationsministeriet (C-689/21)

38However, having regard to the importance which primary EU law attaches to citizenship of the Union which, as has been pointed out in paragraph 29 above, constitutes the fundamental status of nationals of the Member States, it is for the competent national authorities and the national courts to determine whether the loss of the nationality of the Member State concerned, when it entails the loss of citizenship of the Union and the rights attaching thereto, has due regard to the principle of proportionality so far as concerns the consequences of that loss for the situation of the person concerned and, if relevant, for that of the members of his or her family, from the point of view of EU law (judgments of 2 March 2010, Rottmann, C‑135/08, EU:C:2010:104, paragraphs 55 and 56, and of 12 March 2019, Tjebbes and Others, C‑221/17, EU:C:2019:189, paragraph 40).