4. EU legislative powers
This chapter examines the sources of EU law. As with domestic law, there are two overarching categories of EU law: primary law and secondary law. EU primary law includes the EU Treaties and the general principles of EU law. Meanwhile, EU secondary law includes regulations, directives, decisions, international agreements, and ‘soft law’. The chapter then looks at the legislative processes that are used to adopt secondary legislation, and assesses when, or in what policy areas, the EU can make law. It also considers two mechanisms that aim to prevent the EU from extending its legislative power beyond what the Treaties have granted it: the principle of subsidiarity and the principle of proportionality. Finally, the chapter addresses the impact of Brexit on EU law, assessing what will happen to EU law in the UK during the Withdrawal Agreement's transition period.