SABATTUS, Maine (AP) — Police are investigating whether a man who led a drive to mandate gun ownership in his town in Maine threatened to shoot President Barack Obama, officials said Tuesday.

A posting on a Facebook account belonging to David Marsters, a retired police officer, used a racial slur and suggested shooting Obama. When someone criticized the posting, the user said Obama "is not a legal president."

Police Chief Tony Ward said Tuesday that initial findings suggest Marsters posted the comment but the investigation is ongoing. Federal law enforcement officials were notified.

Marsters didn't immediately return a phone message.

Town Manager Andrew Gilmore said the comments, first reported by the Sun Journal newspaper, were "deplorably hateful, dangerous, and exactly opposite of all this country and the town of Sabattus stands for."

Town selectmen voted unanimously in March against a proposal by Marsters to require heads of households to own guns for protection. Marsters serves on several town committees and has plans to run for selectman, Gilmore said.