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Pope Francis greets well-wishers as he leaves the Apostolic Nunciature to the United States to go to the Basilica of the National Shrine of the Immaculate Conception on September 23, 2015 in Washington, DC.  AFP PHOTO/MOLLY RILEY        (Photo credit should read MOLLY RILEY/AFP/Getty Images)
Pope Francis greets well-wishers as he leaves the Apostolic Nunciature to the United States to go to the Basilica of the National Shrine of the Immaculate Conception on September 23, 2015 in Washington, DC.  AFP PHOTO/MOLLY RILEY        (Photo credit should read MOLLY RILEY/AFP/Getty Images)

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    Pope Francis' historic trip to the U.S.

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Pope Francis' historic trip to the U.S.

Historic moments as Pope Francis conducts his first mass and makes his first public appearance in the U.S. CNN's Jim Sciutto reports.

Pope Francis' historic trip to the U.S.

Historic moments as Pope Francis conducts his first mass and makes his first public appearance in the U.S. CNN's Jim Sciutto reports.