GREAT FALLS, Mont. (AP) — A human-rights organization is calling on the U.S. Department of Homeland Security to release details about its investigation into a racially charged email sent by one of its immigration officials in Montana.

Montana Human Rights Network director Travis McAdam tells the Great Falls Tribune that his organization is circulating a petition for the release of information about the investigation into Bruce Norum.

Norum is the supervisory detention and deportation officer for Homeland Security's Immigration and Customs Enforcement office in Helena.

Last September, Norum wrote "good read" at the top of a forwarded email message to immigration attorney Shahid Haque-Hausrath. The message argued for a loyalty test for Arab and Muslim Americans.

ICE spokesman Carl Rusnok says the agency does not discuss internal investigations.