Talks over a nuclear deal with Iran are in their final stages before Tuesday’s self-imposed deadline. Progress has been reported on several issues, including limiting centrifuges at Iran’s main nuclear facility to around 6,000. But Iran has reportedly backed off a key pledge to enrich its atomic fuel overseas. Iranian officials are said to have previously agreed to sending uranium stockpiles to Russia, but now want to keep the fuel inside the country. The demand could still be overcome by agreements on regular inspections and sufficiently diluting the fuel. If a preliminary deal is reached by Tuesday, a final agreement would follow by the end of June. From the Swiss city of Lausanne where the talks are underway, we are joined by Trita Parsi, founder and president of the National Iranian American Council.