Prosecutor: Accused NSA leaker may have mishandled secrets before

“This was not the first time the defendant mishandled classified information,” Jennifer G. Solari, an assistant United States attorney, said during a detention hearing, in which she described a recorded jailhouse telephone call and referred to an episode last year in which Ms. Winner placed a portable storage device into a sensitive computer.

It was not clear, either in Courtroom No. 1 or even to federal investigators, whether Ms. Winner had distributed classified information beyond a single N.S.A. report related to Russian hacking activities. But Ms. Solari said the authorities were concerned because Ms. Winner referred to “documents” during a telephone call with her mother.

“I screwed up,” Ms. Winner, 25, the first person to face prosecution by the Trump administration in connection with a leak of sensitive information, said during the call, according to Ms. Solari.