Deputy Prime Minister of Canada of service of Allan J. MacEachen. Before then, Trudeau had given the title of "Senior Minister" to a member of his cabinet. The last to occupy that position was Paul Hellyer. Joe Clark's government did not have a deputy prime minister. Similarly, Prime Minister Stephen Harper did not designate a deputy prime minister, meaning Canada's most recent deputy prime minister was Anne McLellan, who in 2006, was also the first deputy prime minister to lose her seat in the House of Commons. Harper gave special status in the line of authority to members of his cabinet: under an order-in-council issued
Prime Minister of Canada with the augmentation. Canada continues the Westminster tradition of using the title "Prime Minister" when one is speaking to the federal head of government directly; this is in contrast to the United States protocol of addressing the federal head of government as "mister" (as in, "Mister President"); the Department of Canadian Heritage advises that it is incorrect to use the term "Mr Prime Minister". The written form of address for the prime minister should use his or her full parliamentary title: "The Right Honourable [name], <nowiki>[</nowiki>post-nominal letters<nowiki>]</nowiki>, Prime Minister of Canada". However, while in the House of Commons during Question