This week, top diplomats from the P5+1 and Iran are meeting in Lausanne, Switzerland, to hammer out a political framework agreement for a comprehensive, long-term nuclear deal...
Israeli Prime Minister Benjamin Netanyahu is trying to undermine support for the agreement, in part by exploiting partisan politics in Washington.
The sequence of sanctions relief is now the primary obstacle to a nuclear deal with Iran, a European official said last month.
Senators introduced legislation that would impose additional sanctions on Iran if a nuclear agreement is not reached by July.
The chairman of the Senate Foreign Relations Committee says the process for congressional review of nuclear cooperation agreements is a model for handling any agreement with Iran on its nuclear program.