David Cameron

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Britain's Prime Minister David Cameron gestures, as he makes a speech in Aberdeen, Scotland, Monday Sept. 15, 2014. The Prime Minister issued a warning that Thursday's referendum is a "once and for all" decision as he made a last-ditch trip north to urge voters to save the union. (AP Photo/PA, Lynne Cameron) UNITED KINGDOM OUT NO SALES NO ARCHIVE

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U.S. President Barack Obama, right, points as he stands alongside British Prime Minister David Cameron, center, and NATO Secretary General Anders Fogh Rasmussen during a flypast at the NATO summit at the Celtic Manor Resort in Newport, Wales on Friday, Sept. 5, 2014. (AP Photo/Jon Super) ** FILE **

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Both President Obama and British Prime Minister David Cameron (right) have stepped up their rhetoric on the Islamic State group this week, and are hoping to rally international support for defeating the terrorist organization while attending the NATO summit. (Associated Press)

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Photo illustration with President Barack Obama and British Prime Minister David Cameron.

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Prime Minister David Cameron, with German Chancellor Angela Merkel and US President Barack Obama at the G7 Summit in Brussels. (photo courtesy of Cameron's Flickr page)