Vigano's letter alleging a cover-up of the accusations against McCarrick comes as Pope Francis is in Ireland, a predominantly Catholic country that is still reeling from revelations of widespread clergy sex abuse. Despite repeated requests from journalists, the Vatican had not responded to the allegations by midday August 26.
In his statement, Vigano said he had told Francis in June 2013, just after he was elected pope by his fellow cardinals, about the accusations against McCarrick.
Francis said inaction over "these repellent crimes has rightly given rise to outrage, and remains a source of pain and shame for the Catholic community".
Pope Francis said on Sunday he would not respond to explosive accusations by a former top Vatican official that the pontiff had covered up sexual abuse, saying dismissively that the document containing the allegations "speaks for itself".
According to the former nuncio's testimony, the Vatican was informed in 2000 of allegations that Archbishop McCarrick "shared his bed with seminarians" by two former US nuncios - Archbishop Gabriel Montalvo and Archbishop Pietro Sambi.
Vigano is a former papal nuncio for the United States. The document's authenticity was confirmed to The Associated Press by an Italian journalist, Marco Tosatti, who said he was with Vigano when the archbishop wrote it Wednesday.
Pope Francis says he "will not say a single word" on a former archbishop's call for him to resign over his handling of sexual abuse allegations against a prominent cardinal in 2013.
McCarrick, 88, resigned last month in disgrace and was stripped of his title after allegations that he had abused a minor almost 50 years ago and also forced adult male seminarians to share his bed. "Archbishop Viganò has not produced in his testimony any objectively verifiable proof that he in any way communicated to Cardinal Wuerl restrictions imposed on Cardinal McCarrick by Pope Benedict XVI".
In a statement, the Washington Catholic Archdiocese said: "In spite of what Archbishop Vigano's memo indicates, Cardinal Wuerl did not receive any documentation or information during his time in Washington regarding any actions taken against Archbishop McCarrick".
Arsenal vs West Ham, Premier League
In the last match of the pre-season, against Lazio, I did it with Lacazette and Nketiah. "It isn't true", said Emery. He said: " Arsenal won 3-1, but if you analyse the game we had many opportunities to score a goal before".
Vigano's missive, published Saturday, calls for Francis to resign as well.
Pope Francis was spoke bluntly about Archbishop Viganò's charges: "I say this sincerely: Read it attentively and make your own judgment".
Cardinal Farrell told Catholic News Service July 24: "I was shocked, overwhelmed; I never heard any of this before in the six years I was there with him".
On Sunday, Pope Francis told tens of thousands of people gathered in Dublin: "None of us can fail to be moved by the stories of young people who suffered abuse, were robbed of their innocence and left scarred".
Wuerl served as bishop in the Pittsburgh diocese for 18 years.
Cardinal O'Malley has apologized for what he described as an administrative communication failure in which his secretary did not relay to him a 2015 letter from Father Ramsey about allegations against Archbishop McCarrick.
He and the Pope have always been on opposite ideological sides, with the Pope more a pastor and Archbishop Vigano more a cultural warrior.
Vigano was removed from his post in Washington in 2016 by Pope Francis after Vigano was blamed for the controversy that arose after he arranged for the pontiff to meet with a Kentucky clerk who defied a court order to issue marriage licenses to same-sex couples, according to the New York Times.
Last month, the Pope accepted McCarrick's resignation following the release of evidence that he had abused a child.
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