After Wednesday's deadly attack on a nuclear scientist in Tehran, Jeffrey Brown discusses the unclear covert sabotage on Iran's nuclear program with Ronen Bergman from the newspaper Yedioth Ahronoth and David Albright of the Institute for Science and International Security.

Iran vowed Tuesday to seek "important changes" in a United Nations plan that would require it to ship its enriched uranium out of the country for processing abroad, raising alarm among Western governments involved in nuclear talks with the country.

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