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BEKAA VALLEY, LEBANON - SEPTEMBER 14: British Prime Minister David Cameron walks through a tented settlement camp housing Syrian refugee families on September 14, 2015 in the Bekaa Valley, on the Syrian border with Lebanon. Mr Cameron is in the region to see conditons and meet those who have fled their homes in Syria. (Photo by Stefan Rousseau - WPA Pool /Getty Images)

BEKAA VALLEY, LEBANON - SEPTEMBER 14:  British Prime Minister David Cameron walks through a tented settlement camp housing Syrian refugee families on September 14, 2015 in the Bekaa Valley, on the Syrian border with Lebanon. Mr Cameron is in the region to see conditons and meet those who have fled their homes in Syria. (Photo by Stefan Rousseau - WPA Pool /Getty Images)