What Is the Difference Between a Prime Minister and a President?

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A prime minister is often an element of a parliamentary government, while constitutional republics have presidents. Their roles and degree of power differ substantially from one country to another. In constitutional monarchies, like the United Kingdom, the prime minister often assumes the role of a chief executive while the official executive—the monarch—only holds symbolic authority. In other countries, like France and Russia, the prime minister and president share power.