From AP:
Pope Leo XIV on Tuesday urged a breakaway group of traditionalist Catholics to call off its plan to consecrate new bishops without his consent, calling the move a schismatic act and a “sin of extreme gravity.”
“I plead with you and ask you with all my heart: please turn back!” Leo wrote in a letter to the Rev. Davide Pagliarani, the superior of the Society of St. Pius X. Leo issued the last-ditch appeal a day before the society plans to consecrate four new bishops at its seminary in Econe, Switzerland. Under church law, the consecrations constitute a schismatic act, or an intentional rupture of the unity of the Catholic Church, and incur automatic excommunication for the four bishops and the bishop administering the consecration.