FILE - In this Thursday, Nov. 3, 2016 file photo, Air Force Gen. John Hyten, the incoming commander of the United States Strategic Command, speaks to reporters following a change of command ceremony at Offutt Air Force Base in Bellevue, Neb. On Saturday, Nov. 17, 2017, the top officer at U.S. Strategic Command says an order from President Donald Trump or any of his successors to launch nuclear weapons can be refused if that order is determined to be illegal. (AP Photo/Nati Harnik)
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