Under normal circumstances, Congress should not get involved in preliminary treaty negotiations, since it has the option of refusing to pass the document by not mustering a two-thirds vote of approval.
However, by the prior agreement between the Congress and the executive office, any agreement that is reached by the U. S. amd Iran on nuclear arrangements is only subject to the presidential approval and can only be rejected by a two-thirds majority of Congress to override his approval.
With only one-third congressional approval required, the signed agreement would have the force of a treaty, despite the much lower barrier to acceptance.
Does anyone believe that no matter how one-sided the agreement is in Iran's favor that President Barack Obama would be unable to muster the one-third vote necessary for sustaining his actions? That is why Congress not only needs but should get involved in all aspects of the agreement during the negotiations.
Nelson Marans, Silver Spring