Restricting First Use of Nuclear Weapons Act of 2023

This bill requires Congress to declare war before the U.S. can conduct a first-use nuclear strike - meaning a nuclear attack launched without prior nuclear retaliation against the U.S., its territories, or allies. It prohibits using federal funds for such strikes unless explicitly authorized by a congressional declaration of war. The bill directly affects the President’s authority to order nuclear weapons use and the military’s execution of such orders, reinforcing constitutional war powers. It defines "first-use" strictly to prevent unilateral action absent congressional approval, aiming to create a clear legal check on nuclear decision-making.