Nevada’s Attorney General Aaron Ford has opened an investigation into efforts by Republicans in the state to undermine Joe Biden’s victory in the 2020 election by creating a slate of fake pro-Trump electors.

The investigation, which was first reported by Politico, has been unfolding with little fanfare in recent weeks. According to three people with knowledge of the investigation who spoke to Politico, prosecutors have been interviewing witnesses in connection to the fake electors scheme, which in Nevada involved six Republicans. State party Chair Michael McDonald, who signed certificates falsely attesting themselves as certified Electoral College electors, was among them. According to Politico, witnesses who’ve been questioned include former Clark County Registrar of Voters Joe Gloria, who was subjected to threats and intimidation by Trump supporters in the aftermath of the 2020 election.