Advocate-General Tesauro argued his opinion on 17 May 1990 (). He first noted that the injunction sought by Factortame would in fact be available in all Member States except the UK and Denmark. He then proceeded to conclude that a national court must have the power to provisionally set aside a national law which conflicts with Community law, founding his argument on three bases. He recalled that it had been established in Simmenthal (case 106/77) that directly effective Community law provisions create legal rights which are enforceable by individuals from the date of their entry into force, regardless of any contrary national law. It also followed from the ECJ's case law that it was for the legal system of each Member State to designate the procedures intended to protect Community law rights, and that these procedures must not "be adapted so as it make it impossible in practice to exercise the rights which the national courts are required to protect" (case 61/79, Denkavit, ). National courts must, in that respect, apply EC law through available national procedures or, failing that, of their own motion. Focusing on the House of Lords' argument that it could not temporarily suspend the application of a national law, the Advocate-General emphasised the importance of interim relief in every legal system, remarking that its purpose was to ensure that the time needed to establish a right would not deprive that right of any substance. Furthermore, he did not believe that national courts were entitled to give priority to national legislation merely because it had not yet been shown to be incompatible with Community law; if that were the case, rights conferred by national law would have greater protection than that offered to Community law rights.