and the Letters Patent, 1947 issued by King George VI. The office and its functions are instead governed by constitutional conventions and modelled on the same office in the United Kingdom. Qualifications and selection The prime minister, along with the other ministers in Cabinet, is appointed by the governor general on behalf of the monarch. However, by the conventions of responsible government, designed to maintain administrative stability, the governor general will call to form a government the individual most likely to receive the support, or confidence, of a majority of the directly elected members of the House of Commons; as a practical matter, this is often the leader of a party whose members form a majority, or a very large plurality, of the House of Commons. While there is no legal requirement for prime ministers to be MPs themselves, for practical and political reasons the prime minister is expected to win a seat very promptly. However, in rare circumstances individuals who are not sitting members of the House of Commons have been appointed to the position of prime minister. Two former prime ministers—John Joseph Caldwell Abbott and Mackenzie Bowell—served in the 1890s while members of the Senate. Both, in their roles as Government Leader in the Senate, succeeded prime ministers who had died in office—John A. Macdonald in 1891 and John Sparrow David Thompson in 1894. Prime ministers who are not MPs upon their appointment (or who lose their seats while in office) have since been expected to seek election to the House of Commons as soon as possible. For example, William Lyon Mackenzie King, after losing his seat in the 1925 federal election (that his party won), briefly governed without a seat in the House of Commons before winning a by-election a few weeks later. Similarly, John Turner replaced Pierre Trudeau as leader of the Liberal Party in 1984 and subsequently was appointed prime minister while not holding a seat in the House of Commons; Turner won a riding in the next election but the Liberal Party was swept from power. When a prime minister loses their seat in the legislature, or should a new prime minister be appointed without holding a seat, the typical process that follows is that a member in the governing political party will resign to allow the prime minister to run in the resulting by-election. A safe seat is usually chosen; while the Liberal