Explained: Archbishop Viganò has accused the Pope of heresy. What happens now?

In the first trial of its kind in over 35 years, Archbishop Viganò could be excommunicated for criticising the Pope and questioning the legitimacy of the Vatican council. Ian O’Reilly explains the case

For many outside of the Catholic Church, news of the first schism for almost 40 years may have passed them by. For Catholics, and especially traditional Catholics who celebrate the traditional Latin Mass, the trial of the former Vatican ambassador to the USA and Archbishop, Carlo Maria Viganò, has sent shock waves throughout their community.

It also has a significant impact on American Catholicism as a whole, threatening to create a fundamental split and give Pope Francis one of the most challenging crises of his papacy.