President of the Senate (Australia)
The position is provided for by Section 17 of the Constitution of Australia. The Senate elects one of its members as president at the start of each new term, or whenever the position is vacant. This is usually—though not necessarily—a member of the party or coalition that holds the most seats in the Senate. The largest party in the Senate is not always the governing party, as government is determined by the House of Representatives. The President of the Senate and the Speaker of the House of Representatives may consequently be from different parties.
Leader of the Government in the Senate (Australia)
The longest-serving Leader of the Government in the Senate was George Pearce, who held the position for a cumulative total of 15 years in three separate terms between 1914 and 1937. Uniquely, from 10 January to 1 February 1968, the positions of Prime Minister and Leader of the Government in the Senate were held by the same person, John Gorton. After the disappearance of Harold Holt, Gorton – a senator – was elected leader of the Liberal Party and thus ascended to the prime ministership. In line with constitutional convention, he resigned from the Senate to contest a by-election to the House of Representatives.