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After three days of talks focused on halting Iran's uranium enrichment efforts broke down Sunday morning, Sen. Lindsey Graham said Congress would not wait for the next round of negotiations.
Graham said he intends to put forward a measure that would mandate more sanctions on Iran, aimed at forcing the Middle Eastern nation to dismantle its nuclear weapons program - a move that runs counter to the interim steps sought by the negotiating parties gathered in Geneva, Switzerland.
How did we get to this stage in Iranian nuclear talks? CNN's Becky Anderson explains.