Requiring the advice and consent of the Senate or an Act of Congress to suspend, terminate, or withdraw the United States from the North Atlantic Treaty and authorizing related litigation, and for other purposes.

HJRES 89 requires the President to obtain Senate approval (with a two-thirds vote) or new congressional legislation to suspend, terminate, or withdraw from the North Atlantic Treaty (NATO). It prohibits using federal funds for such actions until Congress passes a two-thirds resolution or enacts a law authorizing withdrawal. The bill mandates 180-day written notification to relevant congressional committees (Foreign Affairs and Foreign Relations) before any withdrawal action and authorizes Congress to sue to block unilateral executive moves. This directly affects the executive branch's ability to act unilaterally on NATO membership, reinforcing congressional oversight of treaty obligations.