PHOENIX (AP) — A guilty plea by the leader of an offshoot polygamous sect near the Arizona-Utah border is at risk of being thrown out due to an unmet condition of his deal that hinged on whether others charged in the case also would plead guilty.

Under the terms of Samuel Bateman’s deal, prosecutors can — but aren’t required to — withdraw his guilty plea, after two other men charged in the case rejected plea offers and are now headed to trial.

Bateman, a self-proclaimed prophet who took more than 20 wives, including 10 girls under age 18, pleaded guilty this month to charges of kidnapping and conspiring to transport underage girls across state lines in what authorities say was a yearslong scheme to orchestrate sexual acts involving children.

The U.S. Attorney’s Office in Phoenix declined on Friday to say whether it will withdraw Bateman’s plea.