Attorney General Eric Holder announced in a news conference  on Tuesday that U.S. officials foiled an Iranian-backed terrorist plot to assassinate the Saudi Arabian ambassador to Washington.  The plot, which allegedly involved a Mexican cartel and large sums of money, would have culminated in an assassination on U.S. soil –  a clear violation of international law.  But perhaps more tellingly, this plot reveals major rifts between two of the Middle East's largest nations and within Iran's highest levels of power. To unpack this complicated plot are  Stephen Kinzer, author of "Reset: Iran, Turkey and America's Future," and Mohsen Asgari, correspondent for the BBC in Iran.

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