Politically, Donald was a
Unionist and was opposed to
Home Rule. As part of the
Ulster Covenant campaign against Home Rule the
Northern Whig for Saturday, 25 April 1914 carried an "Appeal to British Trade Unionists to help resist Home Rule" signed by, amongst others, "Thompson Donald, Trade Union Congress delegate 1909 and 1911 – Shipwrights and Ship Constructors Society". Further appeals to trade unionists were issued in subsequent editions of the paper. He played a leading role in the formation of the Trades Union Watch Committee, which became the Unionist Watch Committee and then finally in July 1918 was renamed as the Ulster Unionist Labour Association (UULA). Donald was appointed an Honorary Secretary of this new group, which was organised by
Edward Carson.
Westminster election of 1918 A month after
World War I ended, trade union candidates stood in three Belfast constituencies under the UULA banner during the
Westminster election in December 1918. Donald was successful in his bid for
Belfast Victoria, as he was remembered as one of the organisers of the 1914 meeting against Home Rule, was a member of the
Orange Order and was a
Mason. The
Northern Whig reported that he "was in favour of prohibition" and called for "better school" and housing for labourers. He was supported by Edward Carson. Donald won the seat with 9.309 to the
Labour candidate's 3.469. The other UULA candidates,
William Whitla and
John Carson, also won their seats. Donald, Whitla and Carson, all
backbenchers, were unable to live in London on their annual salaries of £400 and were financially assisted by the
Ulster Unionist Party (UUP). The
Government of Ireland Act 1920 split the Ireland into
Northern Ireland and the
Republic of Ireland, allowing for one Home Rule parliament in each, with Dublin and Belfast as the centres. Both would have limited power and would continue to be represented at Westminster. That July, Donald dismissed the
sackings of Catholic labourers as a conflict "of Unionists and
Sinn Féiners" rather than a religious issue after MP
Joseph Devlin mentioned his concerns in the
House of Commons. In September 1920 Donald commented on the reprisal killing of three
Sinn Féin members, warning that if any more police or soldiers were killed that there would be more than three Sinn Féiners shot.
Northern Ireland election of 1921 The four Unionist candidates who stood for seats in
Belfast East on the new 52-person
Parliament of Northern Ireland were elected, with Donald coming third. In total, all 40 Unionist candidates were returned and the remaining 12 seats went to either
Nationalist or Sinn Féin candidates, who refused to take their seats. In March 1922, concerns were raised about boundaries between the two territories and whether Westminster would give parts of counties
Tyrone,
Fermanagh and
Londonderry to the Provisional Government in Dublin (see
Partition of Ireland). Donald and Devlin were told by the Speaker that they were out of line and it was ultimately decided that boundary lines would be decided by the Parliament of Northern Ireland. Parliamentary records show that Donald was involved in many other debates on this topic in the convening months. In a debate on 26 June 1922 on the second reading of a Bill to abolish
proportional representation (PR) as a voting system in future Northern Ireland elections, Donald said he disliked it because it was cumbersome, but allowed that it provided minority representation, which he felt was necessary. Donald stood in the Westminster elections again in 1922 but lost; he was also unsuccessful during the Parliament of Northern Ireland election in 1925. This marked the end of his political career. == Later years ==