Trump administration actions have accelerated US force posture adjustments in Europe, including canceled deployments, troop reductions of several thousand, and planned cuts to fighter jets, tankers, bombers, and maritime assets, alongside shifts in NATO command roles. These steps reflect pressure on allies over defense spending and support in conflicts such as the Iran campaign, yet formal US withdrawal faces a 2023 statutory requirement for two-thirds Senate approval or congressional legislation. Bipartisan congressional resistance, defense contractor interests, and statements from President Trump at the July 2026 NATO summit affirming continued membership have kept trader-implied probabilities for withdrawal before 2027 extremely low. Upcoming legislative elections and alliance summits could influence further adjustments, but legal and institutional constraints remain the dominant factors shaping consensus.