The Nuclear First-Strike Security Act of 2025

HR 3564, the Nuclear First-Strike Security Act of 2025, requires the President to notify key congressional leaders at least seven days before authorizing a first-use nuclear strike (using nuclear weapons without prior attack on the U.S. or allies). This applies unless the strike occurs under a congressional declaration of war, in response to a nuclear attack on the U.S. or an ally (defined as NATO, Japan, South Korea, or Australia), or during a launch-on-warning scenario. The bill mandates the Secretary of Defense to certify the strike's legality and necessity to congressional leaders before execution. It directly affects the President and Defense Department, adding a formal congressional notification step to nuclear decision-making. The law aims to create a deliberate review period for the most extreme military action.