Sir Jeffrey Mark Donaldson is a British politician who has served as leader of the Democratic Unionist Party (DUP) since June 2021. He has been the Member of Parliament (MP) for Lagan Valley since 1997, and leader of the DUP in the UK House of Commons since 2019. As of 2022, he is Northern Ireland's longest-serving MP.
Donaldson was a member of the Orange Order and served in the Ulster Defence Regiment during the Troubles. He was also the campaign manager for the UUP MP Enoch Powell's successful re-election campaigns in 1983 and 1986. He was the Ulster Unionist Party (UUP) candidate for Lagan Valley at the 1997 general election, and was elected as an MP to the House of Commons. He simultaneously represented the same constituency as a Member of the Legislative Assembly (MLA) in the Northern Ireland Assembly from 2003 to 2010. Donaldson is known for his opposition to UUP leader David Trimble's support of the Good Friday Agreement during the Northern Ireland peace process, especially from 1998 to 2003. In 2003, Donaldson resigned from the UUP, becoming a member of the DUP in the following year.
Donaldson served in the Northern Ireland Executive from 2008 to 2009 as a Junior Minister for First Minister Peter Robinson. After Nigel Dodds lost his seat at the 2019 general election, Donaldson became the DUP Westminster leader. He was a candidate in the May 2021 Democratic Unionist Party leadership election, losing to Edwin Poots. After Poots resigned the following month, Donaldson was elected unopposed to succeed Poots in the June DUP leadership election; he was confirmed in the post by the party's ruling executive on 30 June. He was once again elected to the Northern Ireland Assembly in the 2022 Assembly election, but he subsequently chose to remain as a Westminster MP and not take up his seat.
