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.
Foreign policy of the Barack Obama administration
After the election of centrist moderate Hassan Rouhani as President in 2013, Iran started a new stage of dialogue in its foreign relations in a bid to improve relations with the west. At Rouhani's official visit to New York City to attend the United Nations General Assembly, Obama requested a bilateral meeting with Rouhani, which didn't take place due to time restraints according to Rouhani. Rouhani stated that more time was needed to organise a proper meeting between the two countries' leaders due to the troubled past relationship of the two nations. On 27 September 2013, Iranian Foreign Minister Mohammad Javad Zarif and Secretary of State John Kerry held a one-on-one meeting, the first between the U.S. and Iran in a generation. The rare get-together was groundbreaking, according to Iranian analysts. One day later, Obama and Rouhani spoke with each other on the phone, the highest level of communication between the two nations leaders since the Iranian Revolution of 1979.