Massachusetts Air National Guardsman Jack Teixeira, right, appears in U.S. District Court in Boston. A judge is expected to hear arguments Thursday over whether Teixeira, accused of leaking highly classified military documents about the Ukraine war and other issues, should remain in jail while he awaits trial. If Pentagon leak suspect Jack Teixeira was a known danger to the public, experts are asking, why did he get a top-secret security clearance? Source 8j.