Despite some differences, President Obama and Pope Francis shared a laugh during their Thursday meeting at the Vatican. Obama called himself a "great admirer" of the pope. Gabriel Bouys/AFP/Getty Images hide caption

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President Obama and Michelle Obama meet Pope Benedict XVI at the Vatican in 2009. The president will meet Pope Francis at the Vatican on Thursday. Getty Images hide caption

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Then-Bishop Franz-Peter Tebartz-van Elst last August. The Vatican has accepted his resignation. Tebartz-van Elst spent lavishly on renovations at his residence and allegedly made false statements about expensive travel costs. Fredrik Von Erichsen /DPA/Landov hide caption

itoggle caption Fredrik Von Erichsen /DPA/Landov

Marie Collins, who was assaulted as a 13-year-old by a priest in her native Ireland, will be a member of a commission that advises the Roman Catholic Church about confronting and preventing such abuse. Andrew Medichini/AP hide caption

itoggle caption Andrew Medichini/AP