By Madison Williams The U.S. government is reportedly still working with Russia on a possible prisoner exchange. WNBA Brittney Griner’s appeal for her nine-year prison sentence in Russia was rejected Tuesday. The Mercury star and Olympic gold medalist was arrested at a Moscow airport in February, accused of transporting hashish oil in her luggage. She pleaded guilty to the charges in July, with her attorneys arguing she had no intention of breaking the law. After the news was released Tuesday, National security adviser Jake Sullivan released a statement regarding the White House’s continuing f…