The Justice Department’s independent watchdog opened an investigation into the events surrounding the sentencing of longtime Trump associate Roger Stone following an intervention by Attorney General William Barr, a new report claims.

The investigation by DOJ Inspector General Michael Horowitz is reportedly “focused on events in February … when prosecutors for Stone have said they were told to seek a lighter sentence for Stone than they had previously considered,” according to anonymous sources cited by NBC News, with another source claiming testimony from former Stone prosecutor Aaron Zelinsky this summer “triggered” the watchdog’s office to open the inquiry.