FILE - In this Wednesday, Sept. 28, 2016 file photo, Crown Prince Frederik of Denmark and his wife Crown Princess Mary arrive at the U.S. Chamber of Commerce in Washington, for the opening of the U.S. Denmark Trade Mission. At right is Mia Heltberg, 7, who presented Princess Mary with flowers. Crown Prince Frederik and his wife Mary are kicking off a two-day trade mission to Boston. On Thursday, Sept. 29, Frederik is scheduled to join Democratic Boston Mayor Marty Walsh for an event at Boston University highlighting ways to promote urban sustainability and climate resilience, including ways to "future-proof" cities. (AP Photo/Cliff Owen, File)
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