Nuclear program of Iran
U.S. President Obama reportedly sent a letter dated 20 April 2010 to President Lula of Brazil, in which he outlined a proposal of fuel swap. While expressing skepticism that the Iranians would now be willing to accept such a deal, having provided "no credible explanation" for the previous deal's rejection, President Obama wrote "For us, Iran’s agreement to transfer 1,200 kg of Iran’s low enriched uranium (LEU) out of the country would build confidence and reduce regional tensions by substantially reducing Iran’s LEU stockpile." Turkish Prime Minister Recep Tayyip Erdogan received a similar letter. A senior U.S. official told the "Washington Post" that the letter was a response to Iran's desire to ship out its uranium piecemeal, rather than in a single batch, and that during "multiple conversations" U.S. officials made clear that Iran should also cease 20% enrichment; however, the official stated "there was no president-to-president letter laying out those broader concerns".
Mir-Hossein Mousavi
On 28 July 1989, the constitution was amended and approved by Iranian voters in a national referendum with a 97% yes vote. At this time, Mehdi Karrubi had been elected as the new speaker of the parliament, to whom the amended constitution was declared. One of these amendments abolished the position of Prime Minister. Rafsanjani was elected as the fourth president of Iran on 28 July 1989, and became the president on 3 August 1989. Mousavi's premiership ended on the same date. Mousavi was not invited to be a participant in the new government headed by Rafsanjani, and disappeared from the public sphere.