BELLE PLAINE, Kan. (AP) — A former Army infantry soldier described by prosecutors as a Satanist who hoped to overthrow the U.S. government endured a lifetime of victimization, isolation and trauma that led him to become involved with online extremist groups, his defense attorney argued Thursday in a motion seeking lenient punishment.

Jarrett William Smith, a private first class stationed at Fort Riley, Kansas, and previously at Fort Bliss, Texas, was discharged from the military after the 24-year-old admitted in February that he provided information about explosives in September to an FBI unde...