In brief
Polymarket traders see only a 2.2% probability that the United States will formally initiate a withdrawal from NATO before January 1, 2027. Despite ongoing frictions, including a Pentagon purge and a controversial 'loyalty test' survey sent to allies, no concrete steps toward invoking Article 13 have been reported. Our analysis, based on the most recent sources, puts the probability even lower, at approximately 1.5%.
Introduction
The question of a US withdrawal from NATO has resurfaced periodically during the Trump administration, fueled by the president's sharp criticism of allies and his administration's internal upheavals. However, the prediction market on Polymarket, which tracks whether the US will formally initiate withdrawal or provide a notice of denunciation under Article 13 of the North Atlantic Treaty by December 31, 2026, assigns a very low probability of 2.2% to the 'Yes' outcome. This analysis examines the current state of play using verified sources as of September 7, 2026.
What to know
The event resolves to 'Yes' if the US government submits a formal notice of withdrawal as per Article 13, regardless of whether implementation is later halted by judicial or other actions. Exiting the integrated military command structure does not count. The resolution source will be official US or NATO information, or a consensus of credible reporting.
As of September 2026, the Trump administration has not filed such a notice. Recent developments include: a purge of military leaders by Defense Secretary Pete Hegseth (Source 1), a government shutdown averted (Source 3), and a planned meeting between the German defense chief and Hegseth (Source 4). The US also sent a questionnaire to NATO allies dubbed a 'loyalty test' by critics (Source 13). Meanwhile, President Trump stated that Putin will not attack NATO territory (Source 9), and CIA Director John Ratcliffe visited Moscow to warn Russia against targeting NATO members (Source 11). These events indicate ongoing engagement rather than withdrawal.
A Brookings analysis notes the legal complexities of a withdrawal, suggesting it would face significant domestic and international hurdles (Source 17). The Atlantic Council warns that political polarization could be exploited by Russia to widen the US-Europe divide, but this does not equate to a formal US withdrawal (Source 16).
The market numbers
| Outcome | Probability |
|---|---|
| Yes | 2.2% |
| No | 97.8% |
Data from Polymarket as of September 7, 2026. Total volume: $6,320,731. Total liquidity: $62,150.
The factors at play
- Trump's rhetoric vs. actions: President Trump has criticized NATO but has not taken formal steps toward withdrawal. His recent statement that Putin won't attack NATO territory (Source 9) suggests he is not seeking to undermine the alliance's core commitment.
- Pentagon turmoil: The Hegseth-led purge (Source 1, Source 5) is causing internal disruption but does not directly affect the NATO withdrawal process, which requires State Department and presidential action.
- Alliance dynamics: The US 'loyalty test' survey (Source 13) has caused friction, but it is seen by former officials as unlikely to guide actual policy. The planned meeting with Germany (Source 4) indicates continued defense cooperation.
- Legal and political hurdles: Any withdrawal notice would likely face immediate legal challenges and congressional opposition. The Brookings piece (Source 17) outlines the complexity.
- Russian factor: CIA chief's Moscow visit (Source 11) shows the US is actively deterring Russian aggression against NATO members, signaling commitment.
Our prediction
According to our analysis, the most likely outcome is No. Polymarket currently assigns a probability of 97.8% to 'No', while our internal estimate is 98.5%. The slight difference stems from our assessment that the barriers to withdrawal are even higher than the market suggests: no credible source reports any preparation of a withdrawal notice, and the administration's recent actions (meetings, surveys, deterrent signals) indicate continued engagement, not exit.
Risks and uncertainties
- Sudden policy shift: President Trump could surprise observers by ordering a withdrawal notice. His unpredictable nature remains a risk.
- Escalating tensions: If a major crisis occurs (e.g., Russian attack on a NATO member), Trump might use withdrawal as a leverage tactic.
- Legal ambiguity: The market resolution criteria include actions that are immediately halted by courts; a symbolic notice could be filed even if unlikely to be implemented.
- Misinterpretation of events: The 'loyalty test' or other friction could be misread as a precursor to withdrawal, but current evidence does not support that.
Conclusion
The Polymarket market reflects a strong consensus that the US will not formally initiate NATO withdrawal before 2027. Our analysis, grounded in the most recent sources, supports this view with even greater confidence. While tensions exist, the concrete steps required for a 'Yes' resolution have not been taken, and the political, legal, and diplomatic costs of such a move remain extremely high.
This content is for informational purposes only and does not constitute financial, political or investment advice, betting advice, or any operational recommendation.