The Bush Administration has pursued several avenues to attempt to contain or end the potential threat posed by Iran, at times pursuing limited engagement, and at other times leaning toward pursuing efforts to change Iran's regime. Some experts believe a potential crisis is looming over Iran's nuclear program because the Bush Administration is skeptical that efforts by several European allies to prevent a nuclear breakout by Iran will succeed, although the Administration announced steps in March 2005 to support those talks. Some advocate military action against Iran's nuclear infrastructure, but others believe that a combination of diplomatic and economic rewards and punishment are the only viable options on the nuclear issue. U.S. sanctions currently in effect ban or strictly limit U.S. trade, aid, and investment in Iran and penalize foreign firms that invest in Iran's energy sector, but unilateral U.S. sanctions do not appear to have materially slowed Iran's WMD programs to date. Other major U.S. concerns include Iran's policy in the Near East region, particularly Iran's material support to groups that use violence against the U.S.-led Middle East peace process, including Hizballah in Lebanon and the Palestinian groups Hamas and Palestinian Islamic Jihad. Some senior Al Qaeda activists are in Iran as well, although Iran claims they are "in custody" and will be tried. Iran did not obstruct the U.S. effort to oust Iraq's Saddam Hussein, a longtime Tehran adversary, at least partly in the expectation that pro-Iranian Shiite Islamic factions would come to power in Iraq in the aftermath. That result occurred as a product of January 30, 2005 elections there. Iran is also assisting pro-Iranian local leaders in Afghanistan, although that support does not appear to be materially hindering the stabilization and development of Afghanistan. Iran's human rights practices and strict limits on democracy have been consistently criticized by official U.S. and U.N. reports, particularly for Iran's suppression of political dissidents and religious and ethnic minorities. However, Iran does hold elections for some positions, including that of president, suggesting to some experts that there might be benefits to engaging Iranian officials. According to this view, new sanctions or military action could harden Iran's positions without necessarily easing the potential threat posed by Iran. For further information, see CRS Report RS21592, Iran's Nuclear Program: Recent Developments, CRS Report RS21548, Iran's Ballistic Missile Capabilities; and CRS Report RS20871, The Iran-Libya Sanctions Act. This report will be updated as warranted by developments.