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Article 9 TEU
Definition of EU citizenship
Under Article 9 of the TEU and Article 20 of the TFEU, every person holding the nationality of a Member State is a citizen of the Union. Nationality is defined according to the national laws of that State. Citizenship of the Union is complementary to, but does not replace, national citizenship. EU citizenship comprises a number of rights and duties in addition to those stemming from citizenship of a Member State. In case C-135/08 Janko Rottmann v Freistaat Bayern, Advocate General Poiares Maduro at the CJEU explained the difference (paragraph 23):
‘Those are two concepts which are both inextricably linked and independent. Union citizenship assumes nationality of a Member State but it is also a legal and political concept independent of that of nationality. Nationality of a Member State not only provides access to enjoyment of the rights conferred by Community law; it also makes us citizens of the Union. European citizenship is more than a body of rights which, in themselves, could be granted even to those who do not possess it. It presupposes the existence of a political relationship between European citizens, although it is not a relationship of belonging to a people. (…) It is based on their mutual commitment to open their respective bodies politic to other European citizens and to construct a new form of civic and political allegiance on a European scale.
It does not require the existence of a people, but is founded on the existence of a European political area from which rights and duties emerge. In so far as it does not imply the existence of a European people, citizenship is conceptually the product of a decoupling from nationality. As one author has observed, the radically innovative character of the concept of European citizenship lies in the fact that ‘the Union belongs to, is composed of, citizens who by definition do not share the same nationality’. On the contrary, by making nationality of a Member State a condition for being a European citizen, the Member States intended to show that this new form of citizenship does not put in question our first allegiance to our national bodies politic. In that way, that relationship with the nationality of the individual Member States constitutes recognition of the fact that there can exist (in fact, does exist) a citizenship which is not determined by nationality.
That is the miracle of Union citizenship: it strengthens the ties between us and our States (in so far as we are European citizens precisely because we are nationals of our States) and, at the same time, it emancipates us from them (in so far as we are now citizens beyond our States). Access to European citizenship is gained through nationality of a Member State, which is regulated by national law, but, like any form of citizenship, it forms the basis of a new political area from which rights and duties emerge, which are laid down by Community law and do not depend on the State. (…) That is why, although it is true that nationality of a Member State is a precondition for access to Union citizenship, it is equally true that the body of rights and obligations associated with the latter cannot be limited in an unjustified manner by the former.’
Once the UK has left the EU (‘Brexit’), a decision on the acquired rights of British nationals resident in Member States, and of EU citizens living in the UK, has to be made. Over the years, each Member State has vested its nationals with a legal heritage of rights, and EU law also creates a number of individual rights directly enforceable in the courts, according to the jurisprudence of the CJEU (Van Gend & Loos). Limits of that legal heritage could be seen as resting with the national law that gives them effect. Should the UK repeal bill rescind the effects of the Treaties, they could in principle no longer be invoked in UK courts.
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