cnn.com

The United States could end up cooperating with Iran to stop militant gains in Iraq, Secretary of State John Kerry suggested Monday in an interview with Yahoo!News.

But a Pentagon spokesman denied Monday that any military coordination with Iran is in the cards.
…
But in a signal the administration hasn’t yet reached a conclusion about what to do, two administration officials said the United States wasn’t interested in teaming up with Iran because the two share few mutual interests.

I’ll side with the two anonymous guys