Dolan, who joined the pope for his flight out of Manhattan, said Francis asked the pilot to make a detour over New York Harbor.
"As we circled Ellis Island, as we circled the Statue of Liberty, I could see he was very 'commosso' - as they say in Italian." The word Dolan chose means "moved."
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Francis has made migration rights a priority of his pontificate, stirred by the crisis affecting Europe in particular but also compelled to speak out for the rights of immigrants to seek a better life for themselves because of his own personal story.
Francis' paternal grandparents, Giovanni and Rosa Margherita Bergoglio, immigrated to Buenos Aires in January 1929 with their son Mario - the pope's father - from Italy's northern Piemonte region.
The significance to the Statue of Liberty and Ellis Island was clear to Francis, Dolan said.
"He said, 'You know, Buenos Aires was a city of immigrants too,'" Dolan said.