This begins a lengthy legislative process. Opponents, who fear the deal would undermine efforts to stop Iran from developing nuclear weapons, would have to pass the resolution by two-thirds majorities in the House and Senate to block it.
The Democratic sponsor of the resolution, Howard Berman, said he would not necessarily oppose the deal but needed to introduce the resolution to allow more time to consider the deal.
"There are some good arguments for the agreement, and some good ones against it," he said, adding that the administration needs to convince him that the deal will help international efforts to rein in Iran's nuclear program. "I chose to introduce a resolution of disapproval today because I want the administration to understand that I will not support the agreement until that question, on the most critical foreign policy issue facing our nation today, is answered to my satisfaction."
Iran acknowledges that it is enriching uranium but insists it is for peaceful civilian usage.
The administration of President George W. Bush views the agreement with Russia as a breakthrough in cooperation reached at a time of rising tensions between Washington and Moscow over issues including missile defense, NATO expansion and differences on Iran. Opponents believe that the deal will reward Russia at a time they say Moscow is not doing enough to stop Iran's nuclear program.
The resolution's other sponsor, Republican Representative Ileana Ros-Lehtinen, is seeking to block the deal.
The agreement would give the United States access to state-of-the-art Russian nuclear technology and would help Russia establish an international nuclear fuel storage facility.
Bush reached the deal during a meeting with then-President Vladimir Putin in Sochi in April.




