Some in Washington seek engagement with a professed moderate in Tehran, while others press for even stricter sanctions.
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Statements by certain officials that run counter to official policy could further harm prospects of US-Iran relations.
The same week Obama declared an end to the Iraq War, Congress brought the US closer to confrontation with Iran.
Washington’s attempts to isolate Iran might pave the road to a new conflict in the Middle East.
The Mujahedin-e Khalq, which the US designates a terrorist group, has the backing of prominent American conservatives.