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During the premierships of Robert Askin and Tom Lewis he was Minister for Agriculture.
When the conservatives returned to office in 1949 under Robert Menzies after eight years in opposition, McEwen became Minister for Commerce and Agriculture, switching to Minister for Trade and Industry in 1956.
On 23 March 2010, he was appointed as Minister of State at the Department of Agriculture, Fisheries and Food with special responsibility for Fisheries and Forestry.