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".
Supreme Leader of Iran
In March 1979, shortly after Ruhollah Khomeini’s return from exile and the overthrow of Iran's monarchy, a national referendum was held throughout Iran with the question "Islamic Republic, yes or no?". Although some groups objected to the wording and choice and boycotted the referendum, 98% of those voting voted "yes". Following this landslide victory, the constitution of Iran of 1906 was declared invalid and a new constitution for an Islamic state was created and ratified by referendum during the first week of December in 1979. According to Francis Fukuyama, the 1979 constitution is a "hybrid" of "theocratic and democratic elements" with much of it based on the ideas Khomeini presented in his work "" ("Hukumat-e Islami"). In the work, Khomeini argued that government must be run in accordance with traditional Islamic "sharia", and for this to happen a leading Islamic jurist ("faqih") must provide political "guardianship" ("wilayat" or "velayat") over the people. The leading jurist were known as "Marja'."