Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) - Western diplomats and Iran appear to be inching toward a breakthrough deal that could slow the Middle Eastern nation's suspected progress toward a nuclear bomb while easing some sanctions that have hobbled its economy.
"Any deal is a big deal, given the last three decades-plus of tensions between the United States and Iran," said Richard Haass, president of the Council on Foreign Relations and former adviser to Secretary of State Colin Powell.