"The Obama Administration, as have the several previous Administrations, has articulated U.S. policy goals as ensuring that Iran does not become a nuclear armed state and reducing Iran's ability to undermine U.S. objectives and allies in the Middle East. The Obama Administration has not changed the Bush Administration's characterization of Iran as a 'profound threat to U.S. national security interests,' a perception generated not only by Iran's nuclear program but also by its military assistance to armed groups in Iraq and Afghanistan, to the Palestinian group Hamas, and to Lebanese Hezbollah. However, the Obama Administration has altered the U.S. approach to achieve those goals by expanding direct diplomatic engagement with Iran's government and by offering Iran's leaders a vision of closer integration with and acceptance by the West. To try to convince Iranian leaders of peaceful U.S. intent, the Obama Administration has downplayed discussion of potential U.S. military action against Iranian nuclear facilities and has repeatedly insisted that the United States is not directly or materially supporting the domestic opposition movement that emerged following Iran's June 12, 2009, presidential election."
CRS Report for Congress, RL32048