This report discusses the reasons that Iran is considered a threat to U.S. security, including Iran's nuclear program, involvement with terrorist organizations, and involvement with neighboring countries' local governments. The report also discusses ways which the U.S. hopes to modify Iran's behavior with sanctions, and the effectiveness of these sanctions.

This report discusses the reasons that Iran is considered a threat to U.S. security, including Iran's nuclear program, involvement with terrorist organizations, and involvement with neighboring countries' local governments. It also discusses ways in which the U.S. hopes to modify Iran's behavior with sanctions, and the effectiveness of these sanctions.

The Bush Administration has pursued several avenues to attempt to contain or end the potential threat posed by Iran, at times pursuing limited engagement directly or through allies, and at other times leaning toward pursuing efforts to change Iran’s regime. Over the past two years, the Administration has focused primarily on blunting Iran’s nuclear program by backing diplomatic efforts by European nations and Russia to negotiate permanent curbs on it. International concerns on nuclear issues and other strategic issues have been heightened by the accession of Mahmoud Ahmadinejad, a hardliner, as president. He advocates a return to many of the original principles of the Islamic revolution as set down by the late Ayatollah Ruhollah Khomeini. Some advocate military action against Iran’s nuclear infrastructure, but others believe that continued diplomacy, combined with offers of economic rewards or threats of international sanctions is the only viable option. Still, others believe that only an outright replacement of Iran’s regime would diminish the threat posed by Iran to U.S. interests.

The Obama Administration identifies Iran as a major threat to U.S. national security interests. The sense of imminent crisis with Iran which greeted the beginning of 2012 follows three years in which the Obama Administration first offered Iran's leaders consistent and sustained engagement in exchange for limits to its nuclear program but, since 2010, has emphasized pressuring Iran through economic sanctions. This report discusses the effects of economic sanctions against Iran; support to the Iranian democracy movement; and opposition against Iranian human rights violations and Iranian support for Syrian human rights violations.