srael's President Shimon Peres (L) greets U.S. Senator John Kerry (D-MA) at the start of their meeting in Jerusalem March 1, 2010. The United States is working to close ranks with Israel on how to tackle Iran's nuclear project, Kerry said on Monday, playing down the prospect of the Israelis attacking their arch-foe unilaterally. U.S. senator John Kerry, Chairman of the US Senate Foreign Relations Committee, left, shakes hands with Israeli opposition leader Tzipi Livni during their meeting in Jerusalem, Monday, March 1, 2010. In this photo made available by the Israeli Defense Ministry, U.S. senator John Kerry, Chairman of...