Obama wrote secret letter to Khamenei on Islamic State

President Barack Obama of the United States has allegedly written a secret letter to Iran's Supreme Leader Ayatollah Ali Khamenei to seek his support in the fight against the Islamic State of Iraq and the Levant.

Sources say that Obama wrote the letter to Khamenei last month.

“Obama stressed to Khamenei that any cooperation on Islamic State was largely contingent on Iran reaching a comprehensive agreement with global powers on the future of Teheran’s nuclear programme by a November 24 diplomatic deadline,” said the sources.

This is the fourth letter that Obama has written to the top Iranian leader since coming to power in 2009.

'The correspondence underscores that Obama views Iran as important -- whether in a potentially constructive or negative role -- to his emerging military and diplomatic campaign to push the IS from the territories it has gained over the past six months,' says media reports.

Two top American senators -- John McCain and Lindsey Graham -- expressed their outrage over the letter.

'It is outrageous that, while the cries of moderate Syrian forces for greater US assistance fall on deaf ears in the White House, President Obama is apparently urging Ayatollah Khamenei to join the fight against the IS,' McCain and Graham said in a statement.

'This is the same Iranian regime that has been complicit in the rise of the IS by pushing a violent sectarian agenda throughout the Middle East,' they said.

The White House neither confirmed nor denied the existence of the letter, arguing that it would not comment on the private communications between two world leaders.

“I'm not in a position to discuss private correspondence between the president and any world leader. I can tell you that the policy that the president and his administration have articulated about Iran remains unchanged," the White House Press Secretary, Josh Earnest, told reporters at his daily news conference.

“The US is engaged in conversations with Iran in the context of the P5-plus-1 talks to resolve the international community's concerns about Iran’s nuclear programme, and we have also discussed on the sidelines of those talks on at least a couple of occasions the ongoing campaign that is being conducted against the ISIL by the United States and now more than 60 members who are part of this broader coalition,” he said.

Earnest said the US will not cooperate militarily with Iran in that effort.