FILE - In this Feb. 16, 2015 file photo, head of the sex abuse advisory commission Cardinal Sean Patrick O'Malley, of Boston, attends a press conference, in Rome. O'Malley, Pope Francis’ top adviser on clerical sex abuse, implicitly rebuked the pontiff over his accusations of slander against Chilean abuse victims, saying Saturday, Jan. 20, 2018, that his words were “a source of great pain for survivors of sexual abuse.” (AP Photo/Isabella Bonotto, File)

FILE - In this Feb. 16, 2015 file photo, head of the sex abuse advisory commission Cardinal Sean Patrick O'Malley, of Boston, attends a press conference, in Rome. O'Malley, Pope Francis’ top adviser on clerical sex abuse, implicitly rebuked the pontiff over his accusations of slander against Chilean abuse victims, saying Saturday, Jan. 20, 2018, that his words were “a source of great pain for survivors of sexual abuse.” (AP Photo/Isabella Bonotto, File)

LIMA, Peru (AP) — Pope Francis’ top adviser on clerical sex abuse implicitly rebuked the pontiff for having accused Chilean victims of slander, saying Saturday that his words were “a source of great pain for survivors of sexual abuse.”

Cardinal Sean O’Malley, the archbishop of Boston, said he couldn’t explain why Francis “chose the particular words he used.” He said such expressions had the effect of abandoning victims and relegating them to “discredited exile.”

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In an extraordinary effort at damage control, O’Malley insisted in a statement that Francis “fully recognizes the egregious failures of the church and its clergy who abused children and the devastating impact those crimes have had on survivors and their loved ones.”

Francis set off a national uproar upon leaving Chile on Thursday when he accused victims of the country’s most notorious pedophile priest of having slandered another bishop, Juan Barros. The victims say Barros knew of the abuse by the Rev. Fernando Karadima but did nothing to stop it — a charge Barros denies.

“The day they bring me proof against Bishop Barros, I’ll speak,” Francis told Chilean journalists in the northern city of Iquique. “There is not one shred of proof against him. It’s all calumny. Is that clear?”

The remarks shocked Chileans, drew immediate outrage from victims and their advocates and once again raised the question of whether the 81-year-old Argentine Jesuit “gets it” about sex abuse.

The Karadima scandal has devastated the credibility of the Roman Catholic Church in Chile, and Francis’ comments will likely haunt it for the foreseeable future.

O’Malley’s carefully worded critique was remarkable since it is rare for a cardinal to publicly rebuke the pope in such terms. But Francis’ remarks were so potentially toxic to the Vatican’s yearslong effort to turn the tide on decades of clerical sex abuse and cover-up that he clearly felt he had to respond.

O’Malley headed Francis’ much-touted committee for the protection of minors until it lapsed last month after its initial three-year mandate expired. Francis has not named new members, and the committee’s future remains unclear.

O’Malley, who took over as Boston archbishop from the disgraced Cardinal Bernard Law after the sex abuse scandal exploded there in 2002, was traveling to Peru on Saturday to meet with the pope. His spokesman said the trip was previously scheduled. Francis leaves Sunday to return to Rome.

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“It is understandable that Pope Francis’ statements ... were a source of great pain for survivors of sexual abuse by clergy or any other perpetrator,” O’Malley said in the statement. “Words that convey the message ‘if you cannot prove your claims then you will not be believed’ abandon those who have suffered reprehensible criminal violations of their human dignity and relegate survivors to discredited exile.”

Francis’ comments were all the more problematic because Karadima’s victims were deemed so credible by the Vatican that it sentenced him to a lifetime of “penance and prayer” in 2011 based on their testimony. A Chilean judge also found the victims to be credible, saying that while she had to drop charges against Karadima because too much time had passed, proof of his crimes wasn’t lacking.

Those same victims accused Barros of witnessing the abuse. Yet Francis said he considered their accusations “all calumny” and that he wouldn’t believe them without proof.

Catholic officials for years sought to discredit victims by accusing them of slandering and attacking the church with their claims. But many in the church and the Vatican had come to acknowledge that victims usually told the truth and that the church had wrongly sought to protect its own by demonizing and discrediting the most vulnerable of its flock.

O’Malley said he couldn’t fully address the Barros case because he didn’t know the details and wasn’t involved. But he insisted the pope “gets it” and is committed to “zero tolerance” for abuse.

“Accompanying the Holy Father at numerous meetings with survivors I have witnessed his pain of knowing the depth and breadth of the wounds inflicted on those who were abused and that the process of recovery can take a lifetime,” he said.

Karadima’s victims reported to church authorities as early as 2002 that he would kiss and fondle them in the swank Santiago parish he ran. But only when they went public with their accusations in 2010 did the Vatican launch an investigation that led to his removal from ministry.

The emeritus archbishop of Santiago subsequently apologized for having refused to believe the victims from the start.

Francis reopened the wounds of the scandal in 2015 when he named Barros, a protege of Karadima, as bishop of the southern diocese of Osorno.

His appointment outraged Chileans, badly divided the Osorno diocese and further undermined the church’s credibility in the country.

As recently as 2014, the Vatican was prepared to ask Barros and two other Karadima-trained bishops to resign and take a year sabbatical, according to a January 2015 letter from Francis to Chilean bishops that was obtained by The Associated Press. The plan fell apart, however, and Francis named Barros to head the Osorno diocese.