Pope Francis has refused to respond to claims by a former Vatican diplomat who has called on him to resign.
Archbishop Carlo Maria Vigano also accused the Pope of covering up reports of sexual abuse by a US cardinal.
The pontiff 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.”
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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.
What does Archbishop Vigano allege?
He says the pontiff knew about allegations of sex abuse by a prominent US cardinal for five years before accepting his resignation last month.
Archbishop Vigano says he told Pope Francis in 2013 that Cardinal Theodore McCarrick had faced extensive accusations of sexually abusing lower-ranking seminarians and priests.
The Pope “knew from at least June 23 2013 that McCarrick was a serial predator”., wrote Archbishop Vigano, adding that “he knew that he was a corrupt man, he covered for him to the bitter end”.
“Pope Francis must be the first to set a good example for cardinals and bishops who covered up McCarrick’s abuses and resign along with all of them,” the letter says.
However, Archbishop Vigano has not produced any written or other evidence to verify his alleged 2013 conversation with the Pope.
He served as the Vatican’s envoy in Washington from 2011 until 2016.
He also says he wrote a memo to senior figures in the Vatican as early as 2006, warning that Theodore McCarrick was suspected of abusing adults at a seminary while he was a bishop in New Jersey between 1981 and 2001.
McCarrick, now 88, resigned in disgrace in July.
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