Constitutionalising the end of history? Pitfalls of a non-regression principle for Article 2 TEU

Enforcement and conceptualisation of Article 2 TEU values – Rule of law – A non-regression principle for EU values faces significant pitfalls – Limits of the ‘backsliding’ paradigm informing doctrinal developments under Article 2 TEU – Inadequacy of a progress/regression trajectory as a lens for constitutional developments – Complexity of Article 2 values threatens to render regression assessments simplistic – Non-regression and the equality of member states – Potential conflicts between non-regression and minimum standards as tests for Article 2 compliance