Who does the doctrine of supremacy apply to?

The doctrine of supremacy primarily applies to European Union (EU) law in relation to the laws of its member states. It establishes that EU law takes precedence over national laws, meaning that if there is a conflict between the two, EU law must be applied. This principle ensures uniformity and consistency in the application of EU regulations and directives across all member states. In a broader context, the doctrine can also refer to the supremacy of constitutional law over ordinary legislation within a country's legal framework.