In the Netherlands, no national referendum has been organised to date on the basis of the (temporary) General Law on Referendums. A consultative referendum concerning approval by the Netherlands of the Constitutional Treaty of the European Union (the "European Constitution") was held on 1 June 2005, but that referendum was based upon an ad hoc law. Provision for a referendum was introduced by means of a temporary law that was in force from 2002 to 2004, although it was never applied. It should be stressed that Parliament recently opposed the introduction of the referendum into the constitution. It is because no final decision has yet been taken on the introduction of referendums that there is no provision for them as yet in the constitution.