Overnight Defense: Pentagon dipping into missile, spy plane funds for border wall | Pompeo briefs European allies on Iran | Preps for meeting with Putin | B-52s conduct first mission to deter Iran | Lawmakers set for clash on nuke policy

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...