SAFE PASSAGE.

DAVID MUIR (ABC NEWS) (Off-camera) And there are new questions tonight in Afghanistan over American taxpayer money and whether some of that money is landing in the hands of the Taliban. Huge convoys with supplies for US troops there have to travel through dangerous parts of that country. And who gets paid to protect those convoys? That's what Congress is now asking and so is our Nick Schifrin in Afghanistan tonight. [ABSTRACT FROM PUBLISHER]