Formerly the top Catholic cleric in Australia, Cardinal Pell has become embroiled in the probe in his homeland which last week heard evidence from paedophile priest Gerald Ridsdale, who abused at least 50 boys over two decades.
Pell, who accompanied Ridsdale to court in 1993 when he admitted widespread abuse, has repeatedly denied knowing about any of the offences, helping move the priest to another parish or that he tried to bribe a victim to keep him quiet.
Other victims had demanded Pell, who was appointed by Pope Francis in February 2014 to make the Vatican's finances more transparent, return to give evidence to The Royal Commission into Institutional Responses to Child Sexual Abuse.
The cardinal said last week he was willing to do so and on today the commission officially requested he appear in person when the inquiry next meets in the Victorian town of Ballarat, at a date to be determined.
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Peter Saunders, who was hand-picked by the Pope six months ago to be one of the church's commissioners for the protection of children, said Pell not only had a moral obligation to return but should be removed from his Vatican role.
He alleged in an interview with Australia's Channel Nine that Pell had acted with "callousness, cold-heartedness, almost sociopathic I would go as far as to say, this lack of care", in his approach towards abuse victims.
"And I think it's critical that he is moved aside, that he is sent back to Australia, and that the Pope takes the strongest action against him."
A statement issued by Pell's office said the allegations were "false and misleading".
"From his earliest actions as an archbishop, Cardinal Pell has taken a strong stand against child sexual abuse and put in place processes to enable complaints to be brought forward and independently investigated," it said.