Overnight Defense: McCain in farewell letter: 'We never surrender' | Trump expresses 'respect' for McCain, orders flags re-lowered after backlash | Trump battles Afghanistan inertia | Canceled trip latest bad sign for Korea talks

Happy Monday 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.CLICK HERE to subscribe to the newsletter. THE TOPLINE: ...