NEW : The panel chief warns of Middle East regional war . Both Iran and the U.S. have reasons for wanting to fight the ISIS militant movement in Iraq . Secretary of State Kerry suggests possible cooperation with Iran . Working with Iran would be a necessary evil , says a retired U.S. general who served in Iraq .
NEW : U.N. panel chief warns of Middle East regional war . Both Iran and the U.S. have reasons for wanting to quell the ISIS militant surge in Iraq . Secretary of State Kerry suggests possible collaboration with Iran . Working with Iran might be a necessary evil , says a retired U.S. general who served in Iraq .