Presidency of Mahmoud Ahmadinejad
While the U.S has linked its support for a Palestinian state to acceptance of Israel's "right to exist," Iran's President Mahmoud Ahmadinejad has retorted that Israel should be moved to Europe instead, reiterating Muammar al-Gaddafi's 1990 statement. The U.S. has sent signals to Iran that its posturing against Israel's right to exist is unacceptable in their opinion, leading to increased speculation of a U.S. led attack on Iran's nuclear facilities. Even though Iran has denied involvement in Iraq, then-President Bush warned of "consequences," sending a clear message to Iran that the U.S may take military action against it. The Bush administration considered Iran to be the world's leading state supporter of terrorism. Iran has been on the U.S. list of state sponsors of international terrorism since 1984, a claim that Iran and Ahmadinejad have denied.
Shia theocracy
Under the post-revolution Iranian constitution of 1979, Iran is government first and foremost by the Supreme Leader of Iran, who is responsible for the delineation and supervision of "the general policies of the Islamic Republic of Iran". The Supreme Leader is "Commander-in-Chief" of the armed forces, controls the military intelligence and security operations; and has sole power to declare war. The heads of the judiciary, state radio and television networks, the commanders of the police and military forces and six of the twelve members of the Council of Guardians are appointed by the Supreme Leader. The Assembly of Experts elects and dismisses the Supreme Leader on the basis of qualifications and popular esteem.  The Assembly of Experts is responsible for supervising the Supreme Leader in the performance of legal duties.