New details are emerging about the man officials say walked up to a Secret Service checkpoint Saturday evening, pulled a pistol out of his bag and began shooting at officers who returned fire, killing him. NBC’s Julie Tsirkin reports for TODAY.

New details are emerging about the man officials say walked up to a Secret Service checkpoint Saturday evening, pulled a pistol out of his bag and began shooting at officers who returned fire, killing him. NBC’s Julie Tsirkin reports for TODAY.

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