The Vatican immediately shot down the initiative but said the matter would be discussed at a church meeting next year on the family.
Mueller's article in the Vatican newspaper L'Osservatore Romano seemed aimed at ending the debate before it even off the ground.
Mueller cited repeated documents from popes past and his own office, the Congregation for the Doctrine of the Faith, in rejecting arguments that mercy should win out over church rules or that people should follow their own consciences to decide if their first marriage was valid or not.
"It is not for the individuals concerned to decide on its validity, but rather for the church," he wrote.
Pope Francis has acknowledged the need to address the issue and has said the church's tribunal system needs to be fixed.
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