US President Barack Obama reacts as the sun comes out as he works alongside Britain's Prime Minister David Cameron and students on a school project about the G8 summit during a visit to the Enniskillen Integrated Primary School in Enniskillen, Northern Ireland, Monday, June 17, 2013. [Photo/Agencies]

Britain's Prime Minister David Cameron (L) welcomes Germany's Chancellor Angela Merkel to the Lough Erne golf resort where the G8 summit is taking place in Enniskillen, Northern Ireland June 17, 2013. [Photo/Agencies]