Williamson was initially ordained as a bishop by the Society of St. Pius X, but was excommunicated by the Vatican in 1988. His controversial views resurfaced after a 2008 interview on Swedish television, where he denied the Holocaust. This led Pope Benedict XVI to reinstate him in January 2009 in a bid to heal internal divisions, but his reinstatement quickly backfired as his interview gained widespread circulation. Despite his troubles, Williamson remained a prominent figure in the Society until his death.