Iran has been working to become a nuclear power for a long time. I assume it knows this process would be slow and receive resistance from world powers. Attempting to stop this grab for power, many countries, including the US, have instituted strict sanctions against the country. These sanctions have been successful in causing pain, and Iran is seeking relief from them.
Secretary of State John Kerry has negotiated a deal, along with other nations, to acquire promises Iran would limit its enrichment of nuclear material to reactor grade material, and the supply of material they have which is stronger than that would be destroyed. In exchange for this they will receive $4.2 billion. Please note that according to the deal they have achieved a supply of nuclear material 4 times stronger than needed for nuclear power and almost strong enough to make a nuclear bomb.
There is bipartisan congressional support for renewing sanctions against Iran though, and likely they will get a law ready for a presidential signature. Obama is trying to halt this action and has said. “Unprecedented sanctions and tough diplomacy helped to bring Iran to the negotiating table, and I’m grateful to our partners in Congress who share our goal of preventing Iran from acquiring a nuclear weapon. Imposing additional sanctions now will only risk derailing our efforts to resolve this issue peacefully, and I will veto any legislation enacting new sanctions during the negotiation.”
History speaks strongly against this deal. If Iran was going to abide by its agreements or international law, it would not have strongly enriched nuclear material to dispose of in the first place. Predictably we will see a continuation of Iran’s past behavior of hiding what they are doing. When the truth is finally discovered we will find out our economic support payments actually funded their efforts to become a nuclear power