The Threat of a U.S. NATO Withdrawal
Former U.S. President Donald Trump has renewed threats to pull the United States out of NATO. This follows a refusal by European allies to deploy naval forces to help secure the Strait of Hormuz. Trump dismissed the alliance as a 'paper tiger' and stated that a U.S. withdrawal from the defense pact is now a non-negotiable position.
While Article 13 of the North Atlantic Treaty allows a member state to leave by providing one year's notice, no country has ever done so in NATO's 77-year history. The legal landscape changed significantly in 2023 when President Joe Biden signed a law prohibiting the president from unilaterally withdrawing the U.S. from NATO. This law now requires a two-thirds majority vote in the U.S. Senate to approve any such exit.
Consequences and Legal Constraints
The 2023 legislation also imposes a financial embargo, blocking the use of federal funds for any withdrawal process. A key co-sponsor of this prohibition was Senator Marco Rubio, who previously served as Secretary of State and National Security Advisor in the Trump administration. Rubio had earlier called for a reassessment of relations with NATO following the outbreak of hostilities against Iran in late February 2026.
Complicating the matter further, a 2020 U.S. Department of Justice opinion asserted that the president holds the exclusive authority to terminate international treaties without congressional consent. This conflicting legal backdrop highlights the profound complexity and potential foreign policy ramifications of any attempt to leave the alliance.
In this context, it is crucial to understand the profound global geopolitical consequences a U.S. exit from NATO would entail.
Source: International relations experts
NATO remains a cornerstone of collective security for its members, and the prospect of an American departure could fundamentally alter the global balance of power. However, given the new legal hurdles now in place, executing such a withdrawal has become a far more formidable challenge than in the past. The debate underscores the enduring tension between executive power and congressional oversight in U.S. foreign policy.
Understanding the broader implications of Trump's NATO stance is essential, especially in light of his recent remarks regarding European allies' actions in the Strait of Hormuz. For a more detailed analysis of how these tensions could reshape U.S. foreign policy, see our coverage on Trump's threats to withdraw from NATO.