Like his grandfather, Lord Monteagle was a moderate unionist when he assumed his seat in the House of Lords. He was initially a member of the Liberal Party, and in 1885 wrote a pamphlet entitled Liberal Policy in Ireland. The following year he became a Liberal Unionist out of a fear that Gladstone's1886 Home Rule bill would lead to full independence for Ireland, and the dissolution of the United Kingdom. As a consequence, Lord Monteagle sat with the peers of the Irish Unionist Alliance and he became a leading figure among moderate Southern Unionists. As a resident of Ireland he witnessed the deterioration of the political situation during the 1890s. He gradually became of the opinion that unionists had to recognise that in order to protect the Union, a compromising and workable agreement would need to be reached with Irish nationalists. In 1911, he was a founding member, and later president, of the Proportional Representation Society of Ireland, believing that proportional representation would help to prevent conflict between unionists and nationalists in a self-governing Ireland. In 1917, he helped to arrange the Irish Convention, using his personal connections to ensure that the interests of Sinn Féin were represented after the party leadership refused to attend. The same year, he publicly identified himself as a moderate who still believed in the principle of Union but recognised that it was not working for the majority of Irishmen. He was anxious that Ireland should not be divided and in 1919 he left the fractured Unionist Alliance to join the Irish Dominion League. The League was under the leadership of his close friend and cooperative colleague, Sir Horace Plunkett. He subsequently became chairman of the London branch of the League, and attempted to encourage David Lloyd George's government to grant dominion status to a united Ireland in line with the League's views. In June 1920 he arranged meetings between representatives of the British government and the nationalist George Gavan Duffy. A month later he proposed the Dominion of Ireland Bill in the House of Lords, at the same time as the government's Government of Ireland Bill was being debated in the British parliament. His bill would have granted extensive home rule to a united Ireland, with responsibility over all domestic matters as a dominion within the empire. Monteagle argued that the foreign affairs and defence of Ireland should, however, remain the responsibility of the Westminster government. Opposed by both the ConservativeEarl of Dunraven, who argued for a federal union through devolution, and Liberal peers supporting the government's own bill, Monteagle's bill was defeated at second reading on 1 July 1920, by 28 votes for to 41 votes against. He caused indignation in the unionist community in Ireland when, in a February 1920 letter to The Times, he called for an end to the deportation and internment without trial of recently elected Sinn Féin politicians.
