Translate the following English sentence to French:
"Amendments undermining that legal basis, which has been considered valid for over ten years, would not be considered constructive and would ignore the advice of the legal services of all three of the legislative institutions of the European Union, namely the Commission, the Council and indeed the European Parliament itself."
Les amendements minant cette base juridique, considérée comme valide depuis plus de dix ans, ne seraient pas constructifs et ignoreraient les avis des services juridiques des trois institutions législatives de l'Union européenne, à savoir la Commission, le Conseil et, bien sûr, le Parlement européen lui-même.