WASHINGTON - Two influential US senators have asked fellow lawmakers to support demands that Iran accept tough conditions in nuclear talks, including at least two decades of inspections, before Congress would agree to ease sanctions.

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.

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