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ENNISKILLEN, NORTHERN IRELAND - JUNE 17:  Britain's Prime Minister David Cameron (L) and US President Barack Obama (R) wave as they arrive at the G8 venue of Lough Erne on June 17, 2013 in Enniskillen, Northern Ireland. The two day G8 summit, hosted by UK Prime Minister David Cameron, is being held in Northern Ireland for the first time. Leaders from the G8 nations have gathered to discuss numerous topics with the situation in Syria expected to dominate the talks.  (Photo by Matt Cardy/Getty Images)
ENNISKILLEN, NORTHERN IRELAND - JUNE 17:  Britain's Prime Minister David Cameron (L) and US President Barack Obama (R) wave as they arrive at the G8 venue of Lough Erne on June 17, 2013 in Enniskillen, Northern Ireland. The two day G8 summit, hosted by UK Prime Minister David Cameron, is being held in Northern Ireland for the first time. Leaders from the G8 nations have gathered to discuss numerous topics with the situation in Syria expected to dominate the talks.  (Photo by Matt Cardy/Getty Images)

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Obama: European Union strengthens Britain

President Barack Obama urged voters in the United Kingdom to vote to remain in the European Union when they hold a referendum in June.

Obama: European Union strengthens Britain

President Barack Obama urged voters in the United Kingdom to vote to remain in the European Union when they hold a referendum in June.