The content originally appeared on: CNN (CNN)The US is 'actively working' for the release of an American citizen who was detained by the Taliban in Afghanistan in early December, national security adviser Jake Sullivan said Sunday. 'This individual went to Afghanistan after the US drawdown had been completed,' Sullivan told CNN's Jake Tapper on 'State of the Union.' 'I'm not going to get into the sensitivity of it, but I can assure you that it is being handled at the […]