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			 The appeal was made as Iran and six major powers, including the 
			United States, approach a deadline in talks in Vienna aimed at a 
			deal in which Iran would curb its nuclear program in exchange for 
			gradual relief from crippling economic sanctions. 
			 
			Democrat Robert Menendez and Republican Lindsey Graham, who believe 
			President Barack Obama's administration should not act without 
			Congressional backing, distributed a letter among senators saying 
			they want Iran to "come clean" about any military dimensions of its 
			nuclear program. 
			 
			They accused Tehran of a "history of deception in its nuclear 
			program," and said they feared long-term U.S. concerns would not be 
			addressed in any agreement. Rather, a deal ending U.S. sanctions may 
			"provide Iran a window for economic recovery whereafter it could 
			resume its nuclear program," they said. 
			
			  It was unclear how much support the letter, a copy of which was 
			obtained by Reuters on Monday, would attract among the 100 senators. 
			 
			Menendez, chairman of the Senate Foreign Relations committee, and 
			Graham, a member of the Senate Armed Services Committee, also called 
			for immediate resumption of sanctions if Iran did not keep its 
			commitments. 
			 
			The letter sought signatures by Wednesday, four days before the July 
			20 deadline for an agreement 
			 
			With both sides complaining of scant progress, U.S. Secretary of 
			State John Kerry met Iranian Foreign Minister Mohammad Javad Zarif 
			in Vienna on Monday for a second day to push for "critical choices" 
			on Tehran's nuclear program. 
			 
			Some activists who advocate an agreement criticized the letter as an 
			attempt by hawkish lawmakers to derail the talks. 
			 
			
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			"The Senate should be careful not to unnecessarily complicate the 
			process at this critical stage. Otherwise they may be the ones who 
			get the blame for the consequences," said Daryl Kimball, executive 
			director of the Arms Control Association. 
			 
			The Senate's Democratic leaders early this year blocked a bill from 
			Menendez and Republican Mark Kirk that would have cut Iran's oil 
			exports to almost zero and reduced Obama's power to waive sanctions 
			if Tehran violated an interim deal. 
			 
			Lawmakers and congressional aides told Reuters last week they 
			expected Senate leaders would step in again if hawkish lawmakers 
			attempted to pass legislation deemed detrimental to the talks. 
			 
			Adam Sharon, a spokesman for Menendez, said the letter was not an 
			attempt to derail the talks. 
			 
			"There is a role for Congress to play, and it's a role Congress has 
			played for about a decade," he said, noting that U.S. lawmakers had 
			pushed for the current sanctions regime, which helped bring Iran to 
			the negotiating table. 
			
			  
			He would not say how many lawmakers had signed the letter, which was 
			first distributed to senators on Friday. 
			 
			(Reporting by Patricia Zengerle; Editing by David Storey and Lisa 
			Shumaker) 
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