The Congregation for the Doctrine of the Faith, with the approval of Pope Francis, has written a letter to German bishops rejecting their proposal to allow some Protestant spouses to receive Holy Communion, but the Pope does not wish the letter to be made public, the Register has learned.

Sources in the Vatican and Germany say that Archbishop Luis Ladaria, the current prefect of the CDF, wrote the letter and that it was given papal approval.

“It’s a rejection of the pastoral plan,” said a high level source in the German Church, speaking on condition of anonymity, adding that there are “no differences” between Archbishop Ladaria and his predecessor, Cardinal Gerhard Müller, on the matter.

But two senior sources have also confirmed that the Pope wants the letter to remain secret for reasons unknown.