教皇不可謬説
He was excommunicated and resumed his name as Charles Loyson. Soon after, he left France for America, landing in New York City on 18 October 1869. He was warmly welcomed by the leading members of the various Protestant sects in the United States, and though he fraternized with them to a certain extent, he constantly declared that he had no intention of quitting the Catholic Faith. In 1870 he associated himself with Ignaz von Döllinger's protest against the dogma of Papal infallibility.