The scope of executive power varies greatly depending on the political context in which it emerges, and it can change over time in a given country. They are usually laid out in a
constitution In democratic countries, the executive often exercises broad influence over national politics, though limitations are often applied to the executive. In
political systems based on the
separation of powers, government
authority is distributed between several branches to prevent power from being concentrated in the hands of a single person or group. To achieve this, each branch is subject to checks by the other branches; in general, the executive or the
legislature can propose laws, the legislature can pass or block laws, laws are then enforced by the executive, and interpreted by the
judiciary. The executive can also be the source of certain types of law or law-derived rules, such as a
decree,
executive order, or
delegated legislation. For example, the
U.S. federal legislative branch frequently delegates
rulemaking (creation of
regulations) to the
U.S. federal executive branch. In those that have
fusion of powers, typically
parliamentary systems, such as the
United Kingdom, the executive is often referred to as the 'government', and its members generally belong to the political party that controls the legislature. Since the executive requires the support and approval of the legislature, the two bodies are "fused" together, rather than being independent. The principle of
parliamentary sovereignty means powers possessed by the executive are solely dependent on those granted by the legislature, which can also subject its actions to judicial review. However, the executive often has wide-ranging powers stemming from the control of the government
bureaucracy, especially in the areas of overall
economic or
foreign policy. == Political creation ==