Timeline: Carlo Maria Viganò

Archbishop Carlo Maria Viganò, declared excommunicated for schism in 2024, posted a critique on X of Leo XIV's 25 September address at the Élysée Palace, which LifeSiteNews republished. He objected to the speech's favourable references to Enlightenment-era thinkers in connection with human rights and to its treatment of France's motto liberté, égalité, fraternité.

The Dicastery for the Doctrine of the Faith announced that an extrajudicial penal process concluded on 4 July had found Archbishop Carlo Maria Viganò guilty of the reserved delict of schism. It declared the latae sententiae excommunication under canon 1364 §1; lifting it is reserved to the Apostolic See.

Archbishop Viganò posted a Dicastery for the Doctrine of the Faith decree of 11 June summoning him on 20 June to answer a charge of schism, citing his denial of Pope Francis's legitimacy and rejection of Vatican II. He did not appear and said he did not recognise the authority of the dicastery, its prefect or the pope.

In a letter to USCCB president Archbishop José Gomez and to CDF officials, Carlo Maria Viganò argued that the CDF's 2020 note neglected proportionality, said there was a grave duty to refuse the vaccines, and asked bishops to support religious exemptions.

Corrispondenza Romana published, in Italian and English, Roberto de Mattei's article 'The Viganò Case: The Archbishop and His Double', alleging that many letters signed by Archbishop Carlo Maria Viganò had been written by one or more other people. Viganò responded that the allegation was completely false.

The Holy See's report on Theodore McCarrick disputed Viganò's description of Benedict-era sanctions and said he had not acted on a 2012 request from Cardinal Marc Ouellet to assess allegations against McCarrick. Viganò denied the report's accusations in an EWTN interview.

A second open letter from Archbishop Viganò, dated 25 October 2020, described the World Economic Forum's 'Great Reset' as a plan by a global elite to subdue humanity through coercive measures. The Anti-Defamation League has described the letter as foundational to the Great Reset conspiracy theory.

Responding to a 1 June essay by Bishop Athanasius Schneider, Archbishop Viganò argued that the Council itself lay at the root of later deviations. After Vatican commentator Sandro Magister wrote that such a wholesale rejection stood at the brink of schism, Viganò defended the idea that the Council be forgotten.

An open letter from Archbishop Viganò dated 7 June 2020 and published by LifeSiteNews framed the pandemic and U.S. protests as part of a spiritual battle and described a 'deep state' and a 'deep church'. President Trump praised it on Twitter on 10 June.

Italian journalist Marco Tosatti told the Associated Press that he had helped Archbishop Carlo Maria Viganò write, rewrite and edit his 11-page testimony against Pope Francis during a three-hour session at Tosatti's home on 22 August 2018, and that he persuaded Viganò to cut claims that could not be documented.

Former U.S. nuncio Archbishop Carlo Maria Viganò released an 11-page statement, published by two conservative U.S. Catholic websites during the pope's visit to Ireland, alleging that Francis had known of restrictions placed on Theodore McCarrick under Benedict XVI. He called on the pope to resign; Francis declined to respond in detail.