GreenbeltBolton shared 1,000 classified diary pages with relatives while writing a Trump memoir, prosecutors said.
He pleaded guilty to retaining classified notes; the US investigation began under Biden and continued after Trump returned.
Sentencing is October 28; he faces up to 5 years in prison and a $2.25 million fine.
Sources: The Guardian, Deutsche Welle, NDTV, Hindustan Times, Dawn