The Necessary Complexity of Consent: Rules and Norms in EU Treaty Making

The idea that EU treaties have become too difficult to amend is a recurring one. This Article explores changing national constitutional rules and norms in the consent stage of EU treaty making in twenty-eight Member States between 1950 and 2016, asking how parliaments, people, and courts came to be much more significant for consent, what the consequences of this shift are, and offering some tentative proposals as to how the challenges this raises could be addressed. EU treaty making has become more complex, but we argue that treaties should be more rather than less difficult to amend where concerns over two-level legitimacy rather than two-level games predominate.