The Dogmatic Council of Trent excommunicates and anathematizes those who publicly teach that someone can receive communion in mortal sin.
2 John 1: 9 Any one who goes ahead and does not abide in the doctrine of Christ does not have God; he who abides in the doctrine has both the Father and the Son.
en.news The radical Munich Cardinal Marx met
Pope Francis on June 11 and wrote a summary of the meeting which Pope Francis signed on June 12 with “F 12-6-18”. The signed text was published by the German bishops on June 27.
Marx’ summary states that the letter of Archbishop Luis Ladaria, the prefect of the Congregation for the Doctrine of the Faith, provides guidance and a framework for interpretation but “no instruction for the action of the Bishops’ Conference”.
Further, the Francis approved text states that the German guidance can be published as an "aid to orientation".
Only on June 21, Francis had stated that he had approved Ladaria’s letter according to which the guidance is “not mature” enough to be published.
Council of Trent (Ecumenical XIX)
Whoever publicly asserts that one may receive communion in mortal sin is excommunicated
If anyone says that faith alone is sufficient preparation for receiving the sacrament of the most Holy Eucharist: let him be anathema. And that so great a Sacrament may not be unworthily received, and therefore unto death and condemnation, this holy Council ordains and declares that sacramental confession must necessarily be made beforehand by those whose conscience is burdened by mortal sin, however contrite they may consider themselves. If anyone moreover teaches the contrary or preaches or obstinately asserts, or even publicly by disputation shall presume to defend the contrary, by that fact itself he is excommunicated. (Denzinger-Hünermann 1661. Julius III, Council of Trent, Session XIV, October 11, 1551)