Question juridique clé
Whether the appeal against annulment of facilitated naturalization is admissible and whether the Federal Tribunal may review the facts and expediency.
Solution extraite
The appeal was formally admissible, but new facts, purely appellatory challenges, and complaints about expediency were inadmissible.
Motifs extraits
Federal Tribunal review is limited to manifestly incorrect fact-finding and legal violations; it does not reassess evidence freely or review expediency.