"The Obama Administration views Iran as a major threat to U.S. national security interests, a perception generated not only by uncertainty about Iran's intentions for its nuclear program but also by its materiel assistance to armed groups in Iraq and Afghanistan, to the Palestinian group Hamas, and to Lebanese Hezbollah. U.S. officials are highly critical of what they say is stepped up Iranian support for Iraqi Shiite militias that have attacked U.S. forces, who are scheduled to leave Iraq by the end of 2011. U.S. officials also accuse Iran of helping Syria's leadership use force and other methods to try to defeat a growing popular opposition movement, and of taking advantage of Shiite majority unrest against the Sunni-led, pro-U.S. government of Bahrain. […] In 2011, in the context of the popular uprisings throughout the Middle East, and perhaps addressing criticism that it did not sufficiently support the popular uprising in Iran in 2009, the Administration has increased its public support of the Iranian opposition 'Green Movement.' Some in the 112th Congress believe the United States should become more vocal in supporting the democracy movement in Iran, and perhaps even provide material support to Iranian activists, but there are no indications the Administration plans to do so. For further information, see CRS [Congressional Research Service] Report RS20871, 'Iran Sanctions'; and CRS Report RL34544, 'Iran's Nuclear Program: Status.'"
CRS Report for Congress, RL32048