Entering Parliament for the family seat at Morpeth, Lord Morpeth supported the Government of his father-in-law, Lord Sunderland, except in the division on Lord Cadogan when he voted against them. Soon afterwards he went into opposition, speaking, 16 Feb. 1722, against Walpole’s proposal that the South Sea Company should be allowed to dispose of part of their capital to pay their debts, and, 26 Oct. 1722, against the augmentation of the army. In 1725 he joined Pulteney in opposing a motion for Lord Macclesfield’s impeachment,
In the next reign Morpeth continued active in opposition, advocating the reduction of the army year after year on the annual estimates. On 4 Feb. 1730 he is described as speaking ‘in his usual manner’ against the retention of the Hessians on British pay. On 13 Feb. 1734 he moved for a bill to make all army officers not above the rank of colonel irremovable except by a court-martial or by an address of both Houses, which was rejected without a division. His last recorded speech in the Commons was made in 1737 on his almost annual motion for reducing the army to 12,000, the Prince of Wales being in the gallery of the House.
