Legitimacy of EU laws is based on international treaty establishing EU, so it depends on how international treaties are handled in constitutions of each country

Legitimacy of EU laws is based on international treaty establishing EU, so it depends on how international treaties are handled in constitutions of each country to see which level of legal power is assigned to them. See also: https://en.wikipedia.org/wiki/Monism_and_dualism_in_international_law https://en.wikipedia.org/wiki/Monism_and_dualism_in_internat...