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PARIS, FRANCE - NOVEMBER 23: British Prime Minister David Cameron shakes hand with French President Francois Hollande after a press conference at the Elysee Palace on November 23, 2015 in Paris, France. The meeting comes over a week after the Paris terrorist attacks that claimed at least 129 lives in the French capital. (Photo by Thierry Chesnot/Getty Images)

PARIS, FRANCE - NOVEMBER 23:  British Prime Minister David Cameron shakes hand with French President Francois Hollande after a press conference at the Elysee Palace on November 23, 2015 in Paris, France.  The meeting comes over a week after the Paris terrorist attacks that claimed at least 129 lives in the French capital.  (Photo by Thierry Chesnot/Getty Images)