US Air National guardsman Jack Teixeira, who was arrested for leaking highly sensitive Pentagon documents, had a troubling history and talked about "violence and murder" on a social media platform, federal prosecutors alleged in a court filing.

Jack Teixeira: Pentagon leaker 'researched mass shootings, talked of culling the weak'

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Jack Teixeira: Pentagon leaker 'researched mass shootings, talked of culling the weak'