thumb|US President Ronald Reagan signing a veto of a bill A veto is a legal power to unilaterally stop an official action. In the most typical case, a president or monarch vetoes a bill to stop it from becoming law. In many countries, veto powers are established in the country's constitution. Veto powers are also found at other levels of government, such as in state, provincial or local government, and in international bodies.
A veto is the legal power of a leader—typically a president or monarch—to unilaterally block an official action, most commonly stopping a bill from becoming law. Veto powers matter because they give these leaders a significant check on what other branches of government can do, and they are typically written into a country's constitution to define how this power works.
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thumb|US President Ronald Reagan signing a veto of a bill A veto is a legal power to unilaterally stop an official action. In the most typical case, a president or monarch vetoes a bill to stop it from becoming law. In many countries, veto powers are established in the country's constitution. Veto powers are also found at other levels of government, such as in state, provincial or local government, and in international bodies.
Some vetoes can be overcome, often by a supermajority vote: in the United States, a two-thirds vote of the House of Representatives and the Senate can override a presidential veto. Some vetoes, however, are absolute and cannot be overridden. For example, in the United Nations Security Council, the five permanent members (China, France, Russia, the United Kingdom, and the United States) have an absolute veto over any Security Council resolution.
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