An influential ally of the 2nd marquess of Hertford in county Antrim, where his father had prospered as the manager of the 5th earl of Antrim’s estates, MacNaghten had been one of the principal pro-Union speakers in the Dublin Parliament and liveliest Members of the Westminster one, and had been appointed to the consolidated treasury board in 1819 in recognition of his services to Lord Liverpool’s ministry.
An anti-Catholic Tory opposed to parliamentary reform, MacNaghten observed privately in 1823 that ‘Nothing annoys me so much as not being well enough to attend the Catholic question’.
It was not the fact that he ceased to be a Member for the county of Antrim when the heir of a noble family came of age. He ceased to be a Member for county Antrim on grounds best known to himself; and which had been approved of by all his friends.
He voted against reforming the Scottish electoral system, 2 June 1823, 26 Feb. 1824, 13 Apr. 1826.
MacNaghten used his access to patronage as a treasury placeman to further the careers of his sons, Charles and Robert, and divided steadily and consistently with his colleagues in government on English and Irish issues until April 1823, when he informed Lord Liverpool that, like Colonel Barry, he would relinquish his office to ‘be at liberty to vote for Mr. Brownlow’s motion’ criticising the decision to proceed with prosecutions arising from the Dublin Orange theatre riot, on ‘information filed ex-officio after bills of indictment against them for the same offence had been thrown out by a grand jury’.
MacNaghten cast his customary votes against Catholic relief, 6 May 1827, 12 May 1828, and divided with government for the grant to the duke of Clarence, 16 Mar. 1827. He retained his place when the short-lived Canning and Goderich ministries succeeded Liverpool’s in 1827, and was kept on when the duke of Wellington became premier in 1828. He divided with his colleagues against Test Act repeal, 26 Feb., on the ordnance estimates, 4 July, and the silk duties, 14 July 1828. The patronage secretary Planta rightly classified him as a Protestant Irishman opposed to Catholic relief in January 1829, when Hertford, Peel and Wellington found the case for conceding emancipation overwhelming. His brother Sir Francis Workman MacNaghten (1763-1843), a lawyer who rose to prominence through service in India, now published a pro-emancipation pamphlet, A View of the Catholic Question as it Relates to Ireland.
I know out of office MacN[aghten] at his age would go out of Parl[iamen]t - he has told me so. I have nobody to put up attached to me and I had rather have an uphill race with MacN[aghten] than walk over the course with Mr. A. B. or C.
Add. 60288, f. 136.
MacNaghten voted against permitting Daniel O’Connell to take his seat for county Clare without swearing the oath of supremacy, 18 May 1829. He received a month’s leave on account of his failing health, 10 Mar. 1830, and is not known to have spoken in debate or voted personally that session. He was paired in the minority against the libel laws amendment bill, 6 July 1830. Despite a recent improvement in his health and spirits and entreaties from Hertford, who promised ‘never during the Parliament to solicit his attendance in the House for a single hour’, he resigned from the treasury and stood down at the dissolution that month.
MacNaghten interrupted his retirement in 1831 to testify on the treasury’s behalf in the case of Burnell v. the duke of Wellington (alleging underpayment for work carried out at York House).
