The motto of the United States Secret Service is "Worthy of Trust & Confidence," and its reputation for being an elite force is unparalleled. But a new book, "Zero Fail: The Rise and Fall of the Secret Service" from The Washington Post's Carol Leonnig, paints an alarmingly different picture of the agency being "in a state of unprecedented peril." Leonnig joins Amna Nawaz to discuss why.

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