The Coalition returned to power in 1949, initially under Robert Menzies and then under Harold Holt. McEwen came to have a major influence on economic policy, particularly in the areas of agriculture, manufacturing, and trade. When Holt died in office in December 1967, he was commissioned as caretaker prime minister while the Liberal Party elected a new leader. He was 67 at the time, the oldest person to become prime minister and only the third from the Country Party. McEwen ceded power to John Gorton after 23 days in office, and in recognition of his service was appointed deputy prime minister, the first time that position had been formally created.