42According to the Court’s case-law, as the rules regarding the manner in which the EU institutions arrive at their decisions are laid down in the Treaties and are not within the discretion of the Member States or of the institutions themselves, the Treaties alone may, in particular cases, empower an institution to amend a decision-making procedure established by the Treaties. Accordingly, to acknowledge that an institution can establish secondary legal bases, whether for the purpose of strengthening or easing the detailed rules for the adoption of an act, is tantamount to according that institution a legislative power which exceeds that provided for by the Treaties (see judgment in Parliament v Council, C‑133/06, EU:C:2008:257, paragraphs 54 to 56).
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