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.
Beføjelsen til at ændre traktaterne for Den Europæiske Union, nogengange kendt som unionens grundlæggende lov, eller endda som dens de facto forfatning, er forbeholdt medlemstaterne, og skal ratificeres af disse i overensstemmelse med deres respektive forfatninger.