In this July 9, 2016, file photo, President Barack Obama speaks at the NATO Summit, in Warsaw, Poland. Obama's foreign policy legacy may be defined as much by what he didn't do as what he did. (AP Photo/Alik Keplicz, File)
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In this July 9, 2016, file photo, President Barack Obama speaks at the NATO Summit, in Warsaw, Poland. Obama's foreign policy legacy may be defined as much by what he didn't do as what he did. (AP Photo/Alik Keplicz, File)
