Trump’s proposal, which as proposed remains years away from being operational, has many uncertainties, not least cost. The “Golden Dome,” modeled after Israel’s “Iron Dome,” would consist of a constellation of interceptors,

President Trump has shared his desire for a defense system like Israel's Iron Dome and requested funding for it during his joint address to Congress in March.

China last week said it is "seriously concerned" about the project and called for Washington to abandon its development.