U.S. and Iran: A timeline of recent events

By Robert Windrem, NBC Senior Investigative Producer and Garrett Haake, Researcher Editor's note: On Monday, July 28, Nightly News will broadcast live from Tehran, Iran, where Brian Williams will conduct an exclusive interview with President Ahmadinejad. In the past six weeks, the U.S. has sent a number of unmistakable signals to Iranian President Mahmoud Ahmadinejad of its willingness to negotiate a broad range of issues, all within the context of resolving the main issue of Iran's nuclear weapons capability. Iran has responded to some of these signals. But on Saturday, Ahmadinejad pushed the back-and-forth a step further when he announced that Iran now possesses 6,000 centrifuges, a significant increase in the number of uranium-enriching machines in its nuclear program. Given that some in the U.S. government believe the... [read full story]