Canadian deputy prime ministers are appointed to the Privy Council and styled as the Honourable (French: l'honorable), a privilege maintained for life.
The position of deputy prime minister was created by Pierre Trudeau in 1977, largely to recognize the long years of service of Allan MacEachen.
Media analysts generally credited the top person on these lists as being the de facto deputy prime minister,[10] although the title was never conferred.
These "order of precedence" lists have no status as a formal line of succession, however, and would carry no special weight in determining who would take over as the new prime minister if an incumbent died in office or was forced to suddenly resign in advance of a leadership convention.
[12] However, media analysts focused on Dominic Leblanc, who despite having been lower in the official order of precedence served on numerous cabinet committees and as the government's liaison with the Senate, as being the "de facto deputy prime minister".
[16] The Liberals were pressed to respond to concerns about lack of representation in cabinet from the prairie provinces potentially driving sentiments of western alienation.
The office has no standing in law and does not carry any formal duties or tasks—that is, it is without a portfolio—though, the prime minister may negotiate or assign specific tasks in conjunction with the title.
According to journalist Joseph Brean of the Postmedia Network, the role can sometimes be "a poisoned chalice, or a leash to keep a rival under close control" rather than an indication that the Prime Minister trusts the authority of the deputy.
Barring extraordinary circumstances, the governor general is expected to follow the wishes of the party, although officially they retain the authority to make the final decision.
Leadership contests to determine the successor to a prime minister are usually held during the final days of the incumbent's term, and are traditionally a lengthy and competitive process.
Due to the routine and relatively minor nature of the role, few to no research sources exist to provide a complete list of everyone who was ever named as acting prime minister.