New York

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First responders from the FDNY and Port Authority exit the stage during the Dedication Ceremony of the National September 11 Memorial Museum in the museum's Foundation Hall on Thursday, May 15, 2014 in New York. (AP Photo/Newsday, Charles Eckert, Pool)

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People attend the Dedication Ceremony of the National September 11 Memorial Museum in the museum's Foundation Hall on Thursday, May 15, 2014 in New York. (AP Photo/Newsday, Charles Eckert, Pool)

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Visitors stand on the memorial plaza to view the program on a television monitor during the dedication ceremony at the National September 11 Memorial Museum in New York, Thursday, May 15, 2014. (AP Photo/Allan Tannenbaum, Pool)

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Former New York Gov. George Pataki speaks as photos of 9/11 victims are projected, during the dedication ceremony in Foundation Hall, of the National September 11 Memorial Museum, in New York, Thursday, May 15, 2014. (AP Photo/Richard Drew, Pool)

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From left, Former U.S. President Bill Clinton sits with his wife former U.S. Secretary of State Hillary Clinton, former New York Governor George Pataki and former New York City Mayor Rudolph Giuliani during the dedication ceremony at the National September 11 Memorial Museum in New York, Thursday, May 15, 2014. (AP Photo/Mike Segar, Pool)

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President Barack Obama speaks at the dedication ceremony for the National September 11 Memorial Museum on Thursday, May 15, 2014 in New York. (AP Photo/John Angelillo, Pool)