Hawthorne came of Downpatrick merchant stock. Having become an Irish barrister, he was the first of his family to sit in Parliament when he was returned, on his own interest and in opposition to the established patron Lord de Clifford, in 1802. The Castle concluded that he would be guided by Lord Castlereagh.
Hawthorne had gone into opposition to Pitt’s second ministry, allegedly because he had not obtained the appointment of secretary to the Board of Control, which he had solicited from Castlereagh.
Hawthorne went on to support Lord Grenville’s administration in 1806, and made himself useful as a committee chairman. He welcomed the repeal of Pitt’s Additional Force Act, which had ‘completely failed’, 17 Apr. 1806, and on 30 Apr., when he was teller for the second reading of the repeal, explained that although he had at first opposed and subsequently rallied to the measure, it could not be shown to have worked: in his most ambitious speech, he took issue with Castlereagh on the statistical proofs. He was ready to reiterate his arguments on 6 May, but the House would not hear him. (Ironically in 1808 he published a pamphlet maintaining that Addington’s defence measures had been the best.) Government noted at the time that Hawthorne wanted ‘provision’ and was unlikely to retain his seat.
In 1812 Hawthorne regained his seat, defeating a member of the government, John Wilson Croker. Despite this and the support of Lady Downshire, who was in opposition, he maintained that he was a supporter of Lord Liverpool’s administration, which included his friend Sidmouth. The latter recommended him to the viceroy if not for the civil under-secretaryship, at least for the Irish treasury board.
Hawthorne’s duties, as well as his wife’s ill health had reduced his parliamentary attendance in 1813, and when the Irish commission was dissolved he wished for provision out of Parliament.
