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On Sunday, Rev. Barber and a broad coalition of clergy from multiple denominations came to the steps of the U.S.

There will also be hundreds of members of the clergy, with each group having a specific dress code for the service.

"The challenge is that you don't have any senior African clergy holding any important position today at the Vatican, and that poses a problem," he said.

At the guesthouse he was surrounded by clergy and rarely alone for long.

Though Francis pledged to tackle the church's ongoing clergy sex abuse crisis, some followers have criticized him for taking only half-hearted measures, or at worst, actively hindering some reforms.