Iran moving to 'threshold' of making atom bomb: US

A senior US government official says Iran is moving toward the threshold of being able to build a nuclear weapon, but Tehran's leaders may be divided over whether to take the final step and actually make one. State Department special adviser Robert Einhorn told a conference Wednesday that Iran is seeking at a minimum to have the option of building a nuclear weapon.
Einhorn said Iran may not have made the political decision to build one and that the country is not close to a 'breakout' of being able to construct one in a short time. Einhorn said the international sanctions against Iran adopted last year are already taking a big toll against the country, but so far Iran has not shown a willingness to negotiate seriously.