The Trump administration's Golden Dome missile-defense plan is drawing fresh fire from Democrats and arms-control advocates, who argue the proposed shield could become a trillion-dollar catalyst for a new nuclear arms race while opening a multiyear revenue opportunity for defense contractors.The system is designed to protect the U.S. from ballistic, hypersonic and cruise missile threats, with the Pentagon describing it as a layered "system of systems" combining space-based sensors, space-based interceptors and existing ground, sea and air defenses.

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