 During 1987 Lefebvre tried to reach an agreement with Cardinal Ratzinger, who was then Prefect of the Congregation for the Doctrine of the Faith and would later become Pope Benedict XVI.However, on September 4, 1987, in Ecône, Lefevre stated that the Vatican was in apostasy and that he would no longer collaborate with Cardinal Ratzinger.On 5 May 1988, Lefebvre signed an agreement with Cardinal Ratzinger to regularize the situation of the Society of St Pius X.