Veto

Explanation

A veto allows the executive to block legislation. In presidential systems like the United States, the president can veto bills passed by Congress; Congress can override a presidential veto with a supermajority (two-thirds in both chambers). Parliamentary systems generally lack a formal executive veto, since the government depends on a parliamentary majority. Constitutional courts in some systems can also exercise a form of veto by striking down legislation as unconstitutional. The UN Security Council grants each of the five permanent members a veto over binding resolutions, making it one of the most consequential vetoes in international politics.