President Obama Writes Rare Letter to Iran's Supreme Leader In a rare outreach to Iran's Supreme Leader Ayatollah Ali Khamenei, President Barack Obama has written a letter about the fight against Islamic State militants, a common enemy in Syria and Iraq, according to diplomatic sources. The U.S. and Iran are each engaged in military efforts to degrade the Islamic State group, essentially putting the longtime foes on the same side in the campaign against the extremists. However, the Obama administration has repeatedly insisted that it is not coordinating and will not coordinate its military actions with Iran, though officials from both countries have discussed the matter more broadly. Obama's letter to Iran's powerful religious leader comes against the backdrop of the looming Nov. 24 deadline in nuclear negotiations between the U.S. and Iran, as well as five other world powers. While Obama has previously sent letters to Khamenei, any communication between the two men has been extremely rare. The Wall Street Journal, which first reported that Obama had sent the letter, said it described a shared interest between the U.S. and Iran in fighting Islamic State militants and stressed that any cooperation on that would be largely contingent on Iran agreeing to the nuclear deal. However, while not confirming nor denying the existence of the letter, administration officials said there were still no plans to cooperate or coordinate with Iran against the militants. "The United States will not cooperate militarily with Iran in that effort," White House spokesman Josh Earnest said. We won't share intelligence with them. Diplomatic sources separately confirmed the existence of the letter to The Associated Press. They did so on the condition of anonymity because they were not authorized to publicly discuss Obama's outreach. Obama authorized a U.S.-led air campaign against Islamic State fighters in Iraq in August and expanded the mission the following month to neighboring Syria. The U.S. is taking action alongside several other nations, including a handful of regional partners. Iran is not part of the U.S. coalition, but it has also been fighting the Islamic State group on the ground. However, Iran's interests in pursuing the Islamic State's defeat differ from those of the Obama administration. Iran is a staunch supporter of Syrian President Bashar Assad, who is a target of the militants and opposed by the U.S. Two chief critics of Obama's foreign policy, GOP Sens. John McCain of Arizona and Lindsey Graham of South Carolina, called it "outrageous" that Obama would seek to enlist Iran in its fight against IS given Iran's support for Assad and Shia extremists throughout the region. "The consequences of this ill-conceived bargain would destroy the Syrians' last, best chance to live in freedom from the brutal Assad regime," the two senators said in a joint statement. U.S. officials have not ruled out the possibility that a nuclear accord with Iran could open the door to discussions on other issues, but they have sought to keep the delicate negotiations focused solely on Tehran's disputed nuclear program. The U.S. and its negotiating partners say Iran is pursuing a bomb, while Iran says its nuclear program is for peaceful purposes. The prospects for a final agreement remain uncertain, with Obama saying on Wednesday that the ability to secure a deal is an "open question."