European Union legislative procedure
The European Union adopts legislation through a variety of legislative procedures. The procedure used for a given legislative proposal depends on the policy area in question. Most legislation needs to be proposed by the European Commission and approved by the Council of the European Union and European Parliament to become law. Over the years the power of the European Parliament within the legislative process has been greatly increased from being limited to giving its non-binding opinion or excluded from the legislative process altogether, to participating equally with the Council in the legislative process. The power to amend the Treaties of the European Union, sometimes referred to as the Union's primary law, or even as its de facto constitution, is reserved to the member states and must be ratified by them in accordance with their respective constitutional requirements. An exception to this are so-called passerelle clauses in which the legislative procedure used for a certain policy area can be changed without formally amending the treaties.
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