[[Iran]] is actively assisting the major Shiite Muslim political factions in Iraq, most of which have long-standing ideological, political, and religious sectarian ties to Tehran. A key U.S. concern is that Iran is purportedly arming the militias fielded by those factions - militias that are committing sectarian violence and, to some extent, attacking U.S. forces. Since December 2006, the Administration has tried to reverse Iranian influence in Iraq while also engaging Iran diplomatically on Iraq. | [[Iran]] is actively assisting the major Shiite Muslim political factions in Iraq, most of which have long-standing ideological, political, and religious sectarian ties to Tehran. A key U.S. concern is that Iran is purportedly arming the militias fielded by those factions - militias that are committing sectarian violence and, to some extent, attacking U.S. forces. Since December 2006, the Administration has tried to reverse Iranian influence in Iraq while also engaging Iran diplomatically on Iraq. |