Overnight Defense: Senate rebukes Trump with Yemen vote | Mattis, Pompeo briefing fails to quell Senate concerns with Saudis | Graham demands CIA briefing on Khashoggi | Pentagon identifies three troops killed in Afghanistan

Happy Wednesday and welcome to Overnight Defense. I'm Rebecca Kheel, and here's your nightly guide to the latest developments at the Pentagon, on Capitol Hill and beyond.THE TOPLINE: The Senate sent a clear signal Wednesday to...