Mr. Gibson lost his right to own guns after his conviction in 2011. Federal law prohibits all those with felony convictions, and those with certain domestic violence misdemeanors, from possessing guns.

Gibson, a high-profile supporter of Donald Trump and one of his "special ambassadors" to Hollywood, lost his right to purchase or own a handgun after a 2011 domestic violence misdemeanor conviction.

Elizabeth Oyer says she was fired as a Justice Department pardon attorney after refusing to restore the gun rights of Trump ally Mel Gibson.