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In page John McEwen:

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It had long been presumed that McMahon, who was both Treasurer and deputy Liberal leader, would succeed Holt as Liberal leader and hence prime minister. However, McEwen sparked a leadership crisis when he announced that he and his Country Party colleagues would not serve under McMahon. McEwen is reported to have despised McMahon personally.[citation needed] More importantly, McEwen was bitterly opposed to McMahon on political grounds, because McMahon was allied with free trade advocates in the conservative parties and favoured sweeping tariff reforms, a position that was vehemently opposed by McEwen, his Country Party colleagues and their rural constituents.[citation needed]