How concerned is the military about insider threats in the National Guard?

The inauguration is now just days away and officials around the country are pulling out all the security stops. But worries kept Washington very much on edge Monday, and the FBI and National Guard are vetting those who are securing Washington, D.C. for ties to extremism. Nick Schifrin reports.

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Видео How concerned is the military about insider threats in the National Guard? канала PBS NewsHour