 The citizenship opt-out stated that European citizenship did not replace national citizenship; this opt-out was rendered meaningless when the Amsterdam Treaty adopted the same wording for all members.Under the Treaty of Lisbon, Denmark can change its opt-out from a complete opt-out to the case-by-case opt-in version applying to Ireland and the United Kingdom whenever they wish.The June Movement, a Danish eurosceptic party and political organization was founded immediately after the referendum, and takes its name from the event.