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

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.