William M. LeoGrande is professor of government at American University in Washington, DC, and co-author with Peter Kornbluh of Back Channel to Cuba: The Hidden History of Negotiations between Washington and Havana.

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Here's why Cuba should be on Francis' agenda when he meets Trump

Commentary: When President Donald Trump meets with Pope Francis next week, a word from the pope could make the difference in keeping the normalization of U.S.-Cuban relations on track.