Exclusive: Inside Iran as top officials talk about the growing showdown with the U.S.

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Lester Holt meets with Iranian Foreign Minister Mohammad Javad Zarif in Tehran, who alleges that he was sanctioned after rejecting a meeting with President Trump -- an assertion the White House has called false. In a rare interview, Ali Shamkhani, the powerful head of Iran’s National Security Council, says that he regrets the Iran nuclear deal.