The relationship between the European Court of Justice (ECJ) and European Court of Human Rights (ECtHR) is an issue in European Union law and human rights law. The European Court of Justice rules on European Union (EU) law while the European Court of Human Rights rules on European Convention on Human Rights which covers the 47 member states of the Council of Europe. Cases cannot be brought in ECtHR against the European Union but the Court has ruled that states cannot escape their human rights obligations by saying that they were implementing EU law.