By Gareth Davies
If the UK withdraws from the EU, then its citizens will cease to be citizens of the Union. That much is simple – Article 20 TFEU doesn’t leave any doubt that Union citizens are those who are citizens of the Member States.
Still, while that provision was once thought to make Union citizenship dependent on national citizenship, in Rottmann the Court turned it neatly around, showing how it made national citizenship equally dependent on EU law. In that case a German citizen was faced with threatened denaturalisation, which would be likely to leave him stateless. He argued that the denaturalisation, because it also deprived him of his Union citizenship, was an interference with his EU law rights, and so should be constrained by EU law.
He won on the principle, although he probably lost on the facts: the Court said that indeed, a national measure which deprives a Union citizen of their Union citizenship clearly falls within the scope of EU law, and is therefore subject to judicial review in the light of EU law rules and principles. However, it went on to say that such a measure is not per se prohibited. It must merely be proportionate. Denaturalising fraudsters probably is, in most circumstances. Continue reading