Overnight Defense: Trump worries Saudi Arabia treated as 'guilty until proven innocent' | McConnell opens door to sanctions | Joint Chiefs chair to meet Saudi counterpart | Mattis says Trump backs him '100 percent'

Happy Tuesday and welcome to Overnight Defense. I'm Ellen Mitchell, and here's your nightly guide to the latest developments at the Pentagon, on Capitol Hill and beyond. And if you don't get our newsletter, CLICK HERE to subscribe.&...