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ISE, JAPAN - MAY 26: British Prime Minister David Cameron walks on the Ujibashi bridge as he visit at the Ise-Jingu Shrine on May 26, 2016 in Ise, Japan. In the two-day summit, the G7 leaders are scheduled to discuss the pressing global issues including counter-terrorism, energy policy, and sustainable development. (Photo by Chung Sung-Jun/Getty Images)

ISE, JAPAN - MAY 26:  British Prime Minister David Cameron walks on the Ujibashi bridge as he visit at the Ise-Jingu Shrine on May 26, 2016 in Ise, Japan. In the two-day summit, the G7 leaders are scheduled to discuss the pressing global issues including counter-terrorism, energy policy, and sustainable development.  (Photo by Chung Sung-Jun/Getty Images)