Prime Minister of New Zealand signed a number of international treaties. In 1967, Keith Holyoake became the first New Zealand prime minister to select candidates for the position of governor-general without any involvement of the British government. Holyoake advised the monarch, Queen Elizabeth II, to appoint Sir Arthur Porritt, the first New Zealand–born governor-general. After the mixed-member proportional (MMP) system was introduced in 1996, prime ministers have had to manage minority governments. The skill of MMP management was exemplified by Helen Clark's nine years as prime minister (1999–2008), when her Labour Party remained in power thanks to a range of confidence and supply agreements with
Spouse of the Prime Minister of Canada Clark, Mackenzie's was Helen Neil, and Diefenbaker's was Edna Brower. Canada has also had one female prime minister, Kim Campbell. As she had finalized her divorce from her second husband, Howard Eddy, in early 1993, there has never been a male spouse of the prime minister (although Campbell's first husband, Nathan Divinsky, did try to attract media attention in 1993 by billing himself as the ex-husband of the prime minister). She briefly dated Gregory Lekhtman, the inventor of Exerlopers, during her term as prime minister, but kept the relationship relatively private and did not involve him in the election campaign.