Mackye was a personal friend of the Duke of Queensberry and Lord Bute, and in opposition to the Pelhams; and in Dupplin’s list of 1754 was the only Scot classed as a Tory—a nonsensical classification. Entirely directed by Bute, Mackye supported the Pitt-Devonshire Administration, and voted, 2 May 1757, against Newcastle and Fox on the Minorca inquiry.
Mackye supported the Grenville Administration and voted against the repeal of the Stamp Act, 22 Feb. 1766. He supported the Chatham Administration, and voted with them on the land tax, 27 Feb. 1767. At the general election of 1768 he was opposed by James Murray of Broughton. Strongly opposed to the creation of fictitious votes, he decided in the autumn of 1767 to abandon the contest.
He died in October 1797.
