New York City

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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, first lady Michelle Obama, former New York City Mayor Michael Bloomberg, former Secretary of State Hillary Rodham Clinton, former President Bill Clinton, and Diana Taylor, tour the Memorial Hall at the National September 11 Memorial Museum, Thursday, May 15, 2014, in New York. (AP Photo/Carolyn Kaster)

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The remains of New York City Fire Dept. truck from Engine Company 21 are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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The remains of New York City Fire Dept. truck from Engine Company 21 are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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The remains of New York City Fire Dept. truck from Engine Company 21 are displayed at the National Sept. 11 Memorial Museum, Wednesday, May 14, 2014, in New York. The museum is a monument to how the Sept. 11 terror attacks shaped history, from its heart-wrenching artifacts to the underground space that houses them amid the remnants of the fallen twin towers' foundations. It also reflects the complexity of crafting a public understanding of the terrorist attacks and reconceiving ground zero. (AP Photo)

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A woman takes a stroll with her child along the Westchester Riverwalk just north of the Tappan Zee Bridge, Tuesday, May 13, 2014, in Tarrytown, N.Y. On Wednesday, President Barack Obama plans to speak by the bridge just north of New York City to press his case that a key federal government fund used to pay for the nation's roads, bridges and ports is running dry and that the economy would be damaged if it is not replenished. (AP Photo/Julie Jacobson)

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A Metro North train streaks along the Hudson River just south of the Tappan Zee Bridge, Tuesday, May 13, 2014, in Tarrytown, N.Y. On Wednesday, President Barack Obama plans to speak by the bridge just north of New York City to press his case that a key federal government fund used to pay for the nation's roads, bridges and ports is running dry and that the economy would be damaged if it is not replenished. (AP Photo/Julie Jacobson)

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Construction crews use barges and cranes as work continues on a replacement for the 58-year-old Tappan Zee Bridge spanning the Hudson River, Tuesday, May 13, 2014, near Tarrytown, N.Y. On Wednesday, President Barack Obama plans to speak by the bridge just north of New York City to press his case that a key federal government fund used to pay for the nation's roads, bridges and ports is running dry and that the economy would be damaged if it is not replenished. (AP Photo/Julie Jacobson)