SYDNEY, Australia — Prime Minister Malcolm Turnbull of Australia said Thursday that Pope Francis should fire an Australian archbishop who is the highest-ranking Catholic official in the world to be found guilty of concealing sex crimes against children.

“He should have resigned, and the time has come for the pope to sack him,” Mr. Turnbull said of Philip Wilson, the archbishop of Adelaide.

Archbishop Wilson, 67, was sentenced this month to 12 months in detention after being found guilty in May of hiding abuse by a priest, Jim Fletcher, in the state of New South Wales in the 1970s.

Mr. Turnbull, who converted to Catholicism in 2002, said he and other political leaders had already called on Archbishop Wilson to resign.