Foreign Policy Cooperation w Congress Has Limit: Iran

http://www.nytimes.com/aponline/2015/01/12/us/politics/ap-us-united-states-iran-sanctions.html

UN ambassador for the US Said that further opposed sanctions on Iran will weaken existing sanctions and more than likely end all negotiations will end the advance for Iran's nuclear program.

If they impose don't new sanctions with Iran then they will maybe start working back with their nuclear program.

For example,  Cuba negotiation was a success and that is what is should be modeled as with the Iran situation. Cuba Communist released 53 prisoners as promised under the negotiations with the US to reestablish diplomatic ties.