1. After the millenium, Weiler's interpretation the European legal order changed significantly with the promotion of his theory of “constitutional tolerance,” where he contrasted European constitutionalism with American or other federal forms of constitutionalism. See, e.g., Weiler Joseph , Federalism without Constitutionalism: Europe's Sonderweg, in The Federal Vision: Legitimacy and Levels of Governance in the United States and the European Union (Kalypso Nicolaidis & Robert Howse eds., 2001).
2. See Weiler, supra note 11, at 175.
3. See Vauchez, supra note 8, at 204–06.
4. The notion “Integration through law” is seldom defined by the authors, who subscribe to the theory and use the notion in their work. See, e.g., Alter Karen , Establishing the Supremacy of European Law: The Making of an International Rule of Law in Europe (2001).
5. Koen has also been the President of the ECJ since October of 2015.