Trump's 'Golden Dome' Missile Defense Could Cost $1.2 Trillion, CBO Finds

What Happens Next

• →Congressional Republicans face internal pressure to reconcile the $1.2 trillion CBO estimate with deficit reduction commitments, creating leverage for defense hawks' opponents to block or restructure the program in appropriations negotiations.
• →Russia and China cite space-based interceptor plans as justification for accelerating their own anti-satellite and hypersonic weapons programs, intensifying a space-domain arms race.
• →Pentagon procurement pipelines for existing missile defense systems such as Aegis and THAAD face funding compression as budget share shifts toward Golden Dome development, slowing near-term readiness upgrades.
• →Defense contractors specializing in space-based systems — Lockheed Martin, Northrop Grumman, L3Harris — see elevated investor interest and lobbying activity as they position for contracts on technology that does not yet exist, inflating valuations ahead of program milestones.

Near-term: Within 1-3 months, the $1.2 trillion CBO estimate becomes a focal point in congressional budget markup hearings, with fiscal conservatives demanding revised cost justifications before advancing FY2026 defense appropriations. Long-term: Over 2-5 years, sustained US investment in space-based interceptors triggers parallel Chinese and Russian counter-programs, establishing space as a formally contested military domain and pressuring the Outer Space Treaty framework toward obsolescence.