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Israeli Prime Minister Benjamin Netanyahu leaves after making a statement to the press about negotiations with Iran at his office in Jerusalem on April 1, 2015. World powers must toughen their stance to reach a "better" deal with Iran aimed at preventing it from obtaining nuclear weapons, Netanyahu said. AFP PHOTO / POOL / DEBBIE HILL (Photo credit should read DEBBIE HILL/AFP/Getty Images)

Israeli Prime Minister Benjamin Netanyahu leaves after making a statement to the press about negotiations with Iran at his office in Jerusalem on April 1, 2015. World powers must toughen their stance to reach a "better" deal with Iran aimed at preventing it from obtaining nuclear weapons, Netanyahu said. AFP PHOTO / POOL / DEBBIE HILL        (Photo credit should read DEBBIE HILL/AFP/Getty Images)