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President Obama sent a letter to Iran's Supreme Leader last month expressing the two countries' shared interest in beating ISIS, according to two sources briefed on the correspondence. The letter, sent in October to Supreme Leader Ayatollah Ali Khamenei, conveyed that there is a shared interest in combating ISIS, but said resolving the talks regarding Iran's nuclear program was a main impediment to greater cooperation, the sources told CNN. One source added it was "the major" impediment. The Wall Street Journal first reported about the letter on Thursday.