This is simply not true. The US National Intelligence Estimate in both 2007 and 2011 found that no evidence exists of Iran having the capability to build a nuclear weapon. One could say 'those crazy CIA far leftist anti-zionists' or one could say that there is more hype than reality to the Iranian nuclear threat.
U.S. wildlife agency looking into Zimbabwe lion death (AP)
from the article: All signs say Iran is racing toward a nuclear bomb