When does customary international law permit an adversary to attack the U.S. in a neutral defense partner's territory?
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President Donald Trump signed the John S. McCain National Defense Authorization Act (NDAA) for fiscal year 2019 into law on Monday afternoon, at an event at Fort Drum military base in upstate New York.
Editor's Note: We’re breaking new ground here at the Foreign Policy Essay—a two-part series. So many of the problems identified in past Foreign Policy Essays and for Lawfare in general revolve directly or indirectly around the question of allied security forces. Competent local security forces can mitigate problems like terrorism and regional stability. Where they work well (let’s say Denmark—we all like Denmark, right?), then U.S.