It attaches the Pontifical Commission Ecclesia Dei to the Congregation for the Doctrine of the Faith (CDF), with its prefect now ex offico president of Ecclesia Dei. William Cardinal Levada will now lead the dialogue with groups dealing with the Missal of Bl. John XXIII. Cardinal Levada's role will principally focus on bringing the Society of Saint Pius X (SSPX) back into communion with Rome, through discussions which are expected to begin with SSPX in September 2009. This is clear when Pope Benedict states in the motu proprio that "With this decision I wish in particular to show paternal solicitude towards the Society of Saint Pius X, with the aim of rediscovering the full communion of the Church"