Obama was asked in an NPR interview broadcast on Monday whether he could envision opening an embassy there during his final two years in office.
"I never say never," Obama said, adding that U.S. ties with Tehran must be restored in steps.
Washington and its partners are hoping to clinch a deal with Iran by July that would set long-term limits on Iran's enrichment of uranium and other activity that could produce material for use in nuclear weapons. Iran says its program is solely for energy production and medical research purposes. It has agreed to some restrictions in exchange for billions of dollars in relief from U.S. economic sanctions....