Obama reportedly sought Khamenei's aid in fighting Islamic State The White House declined to comment Thursday on a news report that President Obama has secretly written to Iranian supreme leader Ayatollah Ali Khamenei seeking his help in fighting the militant group Islamic State and in reaching a nuclear agreement. The report, in the Wall Street Journal, said that Obama wrote to Khamenei in mid-October, suggesting that any cooperation against the militant group would depend on whether Iran and six world powers reach a nuclear deal. If true, the news could alarm America's Arab allies and Israel, regional rivals of Tehran who worry that a U.S.-Iranian alliance would threaten their security. Josh Earnest, the White House press secretary, while not denying the report, said he could not comment on "any correspondence between President Obama and any world leader." He noted that U.S. officials are in talks with Iran about the nuclear deal, and that officials of the two countries have spoken on multiple occasions about the international effort to stop Islamic State militants in Syria and Iraq. Iranian officials declined to comment. The Obama administration has been cautious in discussing contacts with Iran, because of the sensitivity of Sunni Arab states, the Israelis and the Shiite Muslim-dominated government of Iraq. Almost every country in the region opposes the idea of a U.S.-Iranian entente. Obama has written to Khamenei multiple times since 2009. The president now has a strong motive to write to the Iranian leader, with the Nov. 24 deadline for international talks for a nuclear agreement less than three weeks away. A nuclear deal is Obama's highest national security priority, according to presidential aides, who have said it could be as important to his legacy as the Obama healthcare act. In comments at a news conference Wednesday, Obama acknowledged that the deal could founder on the opposition of conservative Iranians. Khamenei, who will cast the deciding vote on any deal, has authorized Iran's president, Hassan Rouhani, to try to negotiate a nuclear deal with six world powers this year. But in public statements, Khamenei has signaled that he is unwilling to make major concessions and has declared that nothing could be gained from talks with Americans. Obama's outreach would serve another U.S. goal: showing the world that the United States has done all it could to try to reach an agreement. As the negotiating deadline approaches, both the West and Iran are competing to demonstrate that they have done everything possible to reach a compromise.