German Chancellor Angela Merkel's spokesman, Steffen Seibert, said Monday the situation in Limburg was "very difficult."
"Of course, it is not the German government's place to give any advice, but I may express the hope that it will be a solution for the faithful, for people's confidence in their church," Seibert said.
Last year, the church tax provided the German church with some 5.1 billion euros ($6.9 billion) in revenue.
Zollitsch said a canon lawyer was on a committee that has been set up to review the costs of the renovation, the financing and how decisions about the restoration evolved. The lawyer, he said, would determine if Tebarz-van Elst had violated canon law regarding the use of church money.
Tebartz-van Elst told the Bild newspaper that the bill was actually for 10 projects and there were additional costs because of regulations on buildings under historical protection.
He traveled to Rome on Sunday for talks at the Vatican about the scandal. It wasn't known if or when he would meet with the pope but no meeting was on Francis' official agenda Monday.
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Geir Moulson and Frank Jordans in Berlin contributed to this report.