Iranian President Hassan Rohani,
Iranian President Hassan Rohani, delivers a speech during an annual rally commemorating anniversary of the 1979 Islamic revolution, February 11, 2014. Photo by AP
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Iran's president says the Islamic Republic rejects the manufacture of nuclear weapons out of principle, not because it is prevented so by treaties.

Hassan Rohani also said that, had Iran wanted weapons of mass destruction, it would be easier for it to make chemical or biological weapons. He made the comments Saturday while addressing Iran's defense ministry officials.

Rohani said that Iran's "beliefs" and commitment to "ethical principles" prevent it from making a bomb.

Iran's Supreme Leader Ayatollah Ali Khamenei has already issued a religious decree banning the production and use of nuclear weapons. He says having such arms is a sin.

The United States and its allies fear that Iran seeks to develop the ability to make a nuclear weapon, should it want one. Iran denies the charge.