the Canadian monarch, represented by the governor general. The prime minister is, instead, the head of government and is responsible for advising the Crown on how to exercise much of the royal prerogative and its executive powers, which are governed by the constitution and its conventions. However, the function of the prime minister has evolved with increasing power. Today, per the doctrines of constitutional monarchy, the advice given by the prime minister is ordinarily binding, meaning the prime minister effectively carries out those duties ascribed to the sovereign or governor general, leaving the latter to act in predominantly ceremonial fashions. As such, the prime minister, supported by the Office of the Prime Minister (PMO), controls the appointments of many key figures in Canada's system of governance, including the governor general, the Cabinet, justices of the Supreme Court, senators, heads of Crown corporations, ambassadors and high commissioners, the provincial lieutenant governors, and approximately 3,100 other positions. Further, the prime minister plays a prominent role in the legislative process—with the majority of bills put before Parliament originating in the Cabinet—and the leadership of the Canadian Armed Forces. Pierre Trudeau is credited with, throughout his tenure as prime minister between 1968 and 1984, consolidating power in the PMO, which is itself filled by political and administrative staff selected at the prime minister's discretion and unaccountable to Parliament. At the end of the 20th century and into the 21st, analysts—such as Jeffrey Simpson, Donald Savoie, Andrew Coyne, and John Gomery—argued that both Parliament and the Cabinet had become eclipsed by prime ministerial power; Savoie wrote: "The Canadian prime minister has little in the way of institutional check, at least inside government, to inhibit his ability to have his way." Indeed, the position has been described as undergoing a "presidentialization", to the point that its incumbents publicly outshine the actual head of state (and prime minister's spouses are sometimes referred to as First Lady of Canada). Former governor general Adrienne Clarkson alluded to what she saw as "an unspoken rivalry" that had developed between the prime minister and the Crown. It has been theorized that such is the case in Canada as its Parliament is less influential on the executive than in other countries with Westminster parliamentary systems; particularly, Canada has fewer MPs, a higher turnover rate of MPs after each election, and a US-style system for selecting political party leaders, leaving them accountable to