Translate the following English sentence to French:
"The Group of the Greens/European Free Alliance has always maintained that the intergovernmental method, which excludes elected Members and does not allow public debate, is a very significant weakness of the reform of the Treaties and a substantial barrier to its success."
Le groupe Verts/ALE a toujours pensé que la méthode intergouvernementale, qui exclut les élus du peuple et empêche le débat public, constitue une grave limite de la réforme des Traités et hypothèque sérieusement son succès.