McCall, together with several other government back-benchers, became disillusioned with the leadership of Prime Minister Robert Menzies, and was disappointed when Menzies failed to form an all-party government with the Australian Labor Party after the 1940 election. On 28 August 1941, he declared that unless Menzies resigned, he would ensure that the government's majority in the House was removed. Menzies resigned the following day.
