Tensions over burden-sharing and European allies’ limited support for U.S. operations in the Iran conflict have driven recent U.S. reviews of NATO commitments, including a Pentagon posture assessment due by early November 2026 and announcements of troop reductions from Germany and elsewhere. The administration has floated further conventional retrenchment under a “NATO 3.0” framework while preserving a nuclear role, with statements from President Trump and Defense Secretary Hegseth highlighting dissatisfaction with spending levels and alliance responsiveness. A 2023 statute requires congressional approval for any formal withdrawal notice under Article 13 of the North Atlantic Treaty, creating a significant procedural barrier. Midterm elections on November 3 and the six-month review timeline represent near-term catalysts that could shape policy direction, though no official denunciation has occurred.