There were five attempts to introduce same-sex marriage in the Northern Ireland Assembly, with a majority supporting legalisation in 2015 but the Democratic Unionist Party exercising its veto powers by filing a petition of concern. Around the time of the successful Irish same-sex marriage referendum in 2015, an Ipsos Mori poll carried out between 20 May and 8 June 2015 found that 68% of people in Northern Ireland supported same-sex marriage.