The US remains bound by the North Atlantic Treaty, with any formal withdrawal requiring congressional authorization under the 2023 Kaine-Rubio provision (22 U.S.C. § 1928f), a constraint reinforced by the proposed NATO Shield Act introduced in September 2026. President Trump has intensified pressure on allies through the “NATO 3.0” framework, directing a six-month Pentagon review of US force posture in Europe—due for recommendations by November 6—that has already produced announced reductions of roughly 5,000 troops from Germany and rotational deployments elsewhere, alongside cuts to assigned aircraft and naval assets. These moves reflect administration emphasis on European conventional defense responsibility and allied alignment on issues such as base access during operations. However, senior officials have stated there are no plans to exit the alliance itself, and strong bipartisan congressional and public support for NATO membership continues to limit unilateral presidential action. Any near-term treaty withdrawal would face significant procedural and political hurdles.