Questione giuridica chiave
Whether the public-law appeal was admissible despite the residence permit's expiry and the marriage-abuse finding.
Decisione estratta
The appeal was admissible because the applicant was still formally married to a Swiss citizen; the question of abuse of rights belongs to the merits.
Motivazione estratta
Under Art. 83(c)(2) LTF, admissibility turns on the existence of a formal marriage. The expiry of the permit and the alleged abuse do not remove jurisdiction at the admissibility stage.