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".
Vice President of Iran
The role of First Vice President was created in the revision of the Constitution in 1989. It took over some of the responsibilities of the Prime Minister. According to Article 124, the First Vice President chairs the board of ministers and coordinates the other vice presidencies, if let by the President. According to Article 131, the First Vice President takes over as acting President in cases where the President in incapacitated, but only if permitted by the Supreme Leader. According to the same Article, the First Vice President (or anyone serving as acting President) must make sure that a new president is elected in fifty days.