There would also be sanctions against states leaving the treaty to develop nuclear weapons.
The Obama administration consistently says that Iran should not be allowed to develop nuclear weapons.
International powers suspect Iran of seeking to develop nuclear weapons - a charge Iran strongly denies.
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Countries such as Iran could use the situation to develop nuclear weapons, he added.
Vice President Joe Biden earlier this week forcefully admonished any attempts by Iran to develop nuclear weapons.
Iran denies it is seeking to develop nuclear weapons and insists its nuclear programme is solely for peaceful purposes.
Israel, along with Western and other powers, has accused Iran of seeking to develop nuclear weapons, a charge Iran denies.
Western governments are trying to tighten the screws on Iran amid growing concern that the country is trying to develop nuclear weapons.
The United States and some European countries say Iran is trying to develop nuclear weapons, which is what they want to stop.
President Barack Obama said last month that Iran was "over a year or so" from being able to develop nuclear weapons.
Mr. STEPHEN HADLEY (National Security Advisor): It confirms that we were right to be worried about Iran seeking to develop nuclear weapons.
They suspect Iran is seeking to develop nuclear weapons, something it denies.
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The United States benefitted both during World War II and during the cold war in being the nation to develop nuclear weapons first.
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One might question why the United States, alone, should be involved in every single case of counties that wish to develop nuclear weapons.
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Behind the IAEA visit, there is the wider issue of what to do if a country is suspected of trying to develop nuclear weapons secretly.
Along with the West, it suspects Iran of trying to develop nuclear weapons under the guise of a civilian nuclear programme, a claim Tehran denies.
He has also taken a hard line towards Iran, repeatedly warning of the danger to the international community of allowing it to develop nuclear weapons.
Tensions over Tehran's alleged attempts to develop nuclear weapons have led to Iran halting oil exports to the UK and France in retaliation for European Union sanctions.
On December 19, CBS reported that US Secretary of Defense Leon Panetta said in an interview with Scott Pelley for 60 Minutes that Iran will not be allowed to develop nuclear weapons.
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Germany has played a leading role in trying to break the diplomatic impasse over Iran's nuclear program, which Tehran says is aimed at generating civilian power but Western nations suspect is to develop nuclear weapons.
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Whether it is true, as Messrs Sherwin and Bird have written elsewhere (though not in their book) that America would not face the threats it does today had it refused to develop nuclear weapons, is debatable.
One of the largest employers was Sandia National Laboratories, a Department of Energy unit established in 1949 to develop nuclear weapons and now also working on solutions to nonmilitary problems in energy, computing and geologic sciences.
But in October, the US announced that one of its officials, James Kelly, had been told by the North Koreans that they were developing a separate uranium enrichment programme, which could also be used to develop nuclear weapons.
The two Leaders also agreed on the need for the international community to send a clear signal to Iran that while it has the right to develop peaceful uses of nuclear energy, Iran should not use this right to develop nuclear weapons capability as stated in UNSC and IAEA resolutions.
The closed cities were created from the late 1940s onwards to develop the Soviet nuclear weapons programme.
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But, whatever Mr Bush's scepticism about the usefulness of sanctions, he is unlikely to pursue a softer policy so long as Iran is suspected of using Russian technology to develop nuclear and biological weapons, devices that Iran's ballistic missiles might be capable of delivering to Israel.
The United States and its allies invaded Iraq in March 2003, accusing Saddam Hussein's regime of concealing stocks of chemical and biological weapons, long-range missiles and efforts to develop a nuclear bomb from U.N. weapons inspectors.
U.S. officials and their allies accuse Iran of operating an illicit nuclear enrichment program to develop atomic weapons, a charge Iran denies.
Iran says it wants to develop nuclear power for peaceful purposes, namely energy for power lines, and denies it wants to produce nuclear weapons.
Unlike nuclear weapons, chemical weapons are inexpensive to develop and stockpile.
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