President Barack Obama walks from Marine One toward Air Force One at Andrews Air Force Base in Md., Thursday, July 7, 2016. Obama is traveling to Poland to attend a NATO summit and then on to Spain. (AP Photo/Susan Walsh)
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President Barack Obama walks from Marine One toward Air Force One at Andrews Air Force Base in Md., Thursday, July 7, 2016. Obama is traveling to Poland to attend a NATO summit and then on to Spain. (AP Photo/Susan Walsh)
