"Iran's influence over the post-Saddam government in Iraq is substantial because the dominant parties in that government have long-standing ties to Tehran. A key concern is that Iran is extending support for related militias in Iraq that are now responsible for much of the sectarian violence in Iraq. The December 6, 2006, report of the Iraq Study Group recommends U.S. engagement with Iran to enlist its help in calming Iraq, a move not endorsed by the Bush Administration, to date. This report will be updated. See CRS [Congressional Research Service] Report RL32048, 'Iran: U.S. Concerns and Policy Responses', by Kenneth Katzman."
CRS Report for Congress, RS22323