June 15, 2012
President Barack Obama
The White House
1600 Pennsylvania Ave NW
Washington, DC 20500
Dear Mr. President:
We  are writing to share our views about discussions between the Iranian  government and the P5+1 over Iran’s nuclear program.  We are concerned  that, while the meetings held earlier this year in Istanbul and Baghdad  unfortunately failed to produce positive progress, Tehran has continued  to expand and accelerate its uranium enrichment activities, according to  the International Atomic Energy Agency (IAEA). It is past time for the  Iranians to take the concrete steps that would reassure the world that  their nuclear program is, as they claim, exclusively peaceful. Absent  these steps, we must conclude that Tehran is using the talks as a cover  to buy time as it continues to advance toward nuclear weapons  capability. We know that you share our conviction that allowing Iran to  gain this capability is unacceptable.
Iran  must come into full cooperation with the IAEA and full compliance with  all relevant United Nations Security Council resolutions, including  verifiable suspension of nuclear enrichment.  While many of us believe,  based on Iran’s history of deceptive and illicit behavior, that Iran  cannot be trusted to conduct any enrichment activities nor retain any  quantity of enriched uranium on its soil for the foreseeable future,  amongst the absolute minimum steps it must take immediately are shutting down of the Fordow  facility, freezing enrichment above 5 percent, and shipping all uranium  enriched above 5 percent out of the country. We understand that this  was the very proposal that the P5+1 advanced during the Baghdad  meeting.  
Were  Iran to agree to and verifiably implement these steps, this would  demonstrate a level of commitment by Iran to the process and could  justify continued discussions beyond the meeting in Moscow.  However, we  still must address the totality of Iran’s problematic nuclear  activities. Barring full, verifiable Iranian compliance with all  Security Council resolutions and full cooperation with the IAEA,  including a new, far more intrusive inspections regime under the  Additional Protocol, we see no circumstances under which Iran should be  relieved from the current sanctions or those scheduled to come into  effect at the end of this month.  Only when Tehran is convinced that the  sanctions will be both unremitting and crippling is there any prospect  for a real diplomatic breakthrough.
On  the other hand, if the sessions in Moscow produce no substantive  agreement, we urge you to reevaluate the utility of further talks at  this time and instead focus on significantly increasing the pressure on  the Iranian government through sanctions and making clear that a  credible military option exists.  As you have rightly noted, “the window  for diplomacy is closing.”  Iran’s leaders must realize that you mean precisely that.
Sincerely,
Robert Menendez         Roy Blunt     Charles E. Schumer       Susan M. Collins
Benjamin L. Cardin        Johnny Isakson     Richard Blumenthal       Kelly Ayotte
Joseph I. Lieberman      James E. Risch     David Vitter   Frank R. Lautenberg      Jerry Moran          Mark L. Pryor      John Cornyn       Robert P. Casey Jr.   John Boozman    Kirsten E. Gillibrand         Jeff  Sessions     Sherrod Brown     Scott P. Brown   Debbie Stabenow  Mike Crapo  Amy Klobucher   John Hoeven     Jeff Merkley    Daniel Coats   Christopher A. Coons    Lisa Murkowski     Ben Nelson   Patrick J. Toomey      Michael F. Bennet     Mike Lee    Daniel K. Inouye   Rob Portman    Jon Tester     Barbara A. Mikulski     Kay R. Hagan   Bill Nelson   Ron Wyden     Mark R. Warnder   Dean Heller     Carl Levin    Mark Begich       
