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Donald Trump's Golden Dome missile defense system, initially budgeted at $175 billion, may reach costs as high as $4.4 trillion over the next 20 years, according to an analysis by Taxpayers for Common Sense. The American Enterprise Institute suggests achieving a near 100% interception rate would necessitate approximately 1.2 million space-based interceptors (SBI), potentially costing around $6 trillion.

The American Physical Society indicates that each enemy missile launch could require hundreds of interceptors, complicating technical execution and raising doubts about the system's operational viability. Concerns over the system's effectiveness and past failures suggest significant challenges ahead.