 Complete the following phrase:  Drake-Brockman was appointed to a casual vacancy as a Country Party senator on 12 August 1958. His appointment expired at the 1958 election, when he was elected to the Senate, with effect from 1 July 1959. He was appointed Minister for Air in John Gortons second ministry, as a result of Dudley Erwins falling out of Gortons favour. He remained minister until the defeat of the William McMahon government at the 1972 election. He was Minister for Aboriginal Affairs and Minister for Administrative Services in Malcolm Frasers caretaker government after 