Overnight Defense: Trump revokes Brennan's security clearance | Brennan fires back: 'I will not relent' | Defense firms bullish on 'Space Force' | Treasury targets Chinese, Russian firms for helping North Korea

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: Weeks after first threatening to do,...