Father Zollner, who also is a member of the Pontifical Commission for the Protection of Minors, also said the Catholic Church "can't ever do enough" to address the problem of clergy sexual abuse.
The "remedies clause" in the state constitution prohibits a retroactive change to the civil and criminal statute of limitations, according to Scarnati.
Auxiliary Bishop Andrew H. Cozzens of St. Paul and Minneapolis said the Catholic Church "desperately needs an independent structure, led by experienced lay personnel, to investigate and review allegations made against bishops, archbishops and cardinals" in an Aug. 31 statement.
The subpoenas seek documents relating to sexual abuse allegations, financial payments to possible victims or the findings from internal church investigations, according to The Associated Press.