The 2017 Treaty on the Prohibition of Nuclear Weapons (TPNW) has renewed historical debates within European states about deterrence versus disarmament. However, in many states there exists a taboo around discussing nuclear deterrence, resulting in an imbalanced debate dominated by the anti-nuclear movement. The TPNW and this taboo have implications for American deterrence and assurance policies, implementation of the Nuclear Posture Review, and NATO nuclear doctrine.