Nevada’s attorney general is investigating six Republican electors who submitted a document to Congress falsely declaring Donald Trump the winner of the 2020 presidential election, a person with knowledge of the case said Wednesday.

It was not immediately clear if the ongoing probe was a criminal or civil matter. But the probe adds to official scrutiny of fake electors in several swing states won by President Joe Biden in 2020, including investigations in Georgia, Michigan and Arizona. Fake electors were charged in Georgia and Michigan, and Trump faces charges both in Georgia and in a federal investigation of his conduct related to the Jan. 6, 2021 Capitol riot.

President Donald Trump announces the nomination of Judge Brett Kavanaugh to be Associate Justice at the U.S. Supreme Court, replacing Justice Anthony Kennedy, in the East Room of the White House, on July 9, 2018. Photo: Diego M. Radzinschi/ALM Former President Donald Trump. Photo: Diego M. Radzinschi/ALM