Pope Francis has refused to respond to claims by a former Vatican diplomat, who has called for him to resign.
Archbishop Carlo Maria Vigano also accused him of covering up allegations of sexual abuse by a US cardinal.
The Pope was asked about the accusations by reporters on his flight back to Rome after this weekend’s Papal visit to Ireland.
He said he would not say a single word in response to the 11-page letter from Archbishop Vigano.
“I will say sincerely that I must say this, to you,” he said, when asked by a journalist about the letter, “and all of you who are interested: Read the document carefully and judge it for yourselves.
“I will not say one word on this. I think the statement speaks for itself.”
The timing of the letter, released as the Pope addressed sexual abuse by priests during his visit to Ireland, has raised questions about whether Pope Francis is facing a coordinated attack from traditionalists within the Catholic hierarchy.
“You have sufficient journalistic capacity to draw conclusions,” Pope Francis told the reporters on board his plane.
“When a little time has passed and you have the conclusions, perhaps I will talk,” he added.