After a number of incidents, including calling for the resignation of Bernard Fellay as the Superior General of the Society of St. Pius X, refusal to stop publishing his weekly email and an unauthorised visitation to Brazil, Williamson was expelled from the Society in 2012. After leaving the Society, Williamson affiliated with the SSPX Resistance, who oppose the Society's potential reconciliation with Rome. He has since consecrated Jean-Michel Faure, Tomás de Aquino Ferreira da Costa, and as bishops in 2015, 2016, and 2017 respectively, meaning that he is once again excommunicated.