Pope To Offer Solidarity With Cubans On Trip To U.S.

That has endeared him to Cuban President Raul Castro, who vowed earlier this year that if Francis kept it up, he would return to the Catholic Church.

It's largely unknown territory for the 78-year-old Argentine Jesuit, who has never visited either country and confessed that the United States was so foreign to him that he would spend the summer reading up on it. His popularity ratings are high in the U.S., but he also has gained detractors, particularly among conservatives over his critiques of the excesses of capitalism.

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