“Golden Dome” could cost taxpayers $1.2 trillion over 20 years, according to a government report issued on Tuesday. ...Even if the system is built, the report concluded, an adversary like Russia or China that has a large arsenal of nuclear weapons could overwhelm it and some missiles would hit their targets. The budget office report found that the “space-based interceptors” the president envisions — satellites armed with missiles orbiting the planet — would consume about 60 percent of the cost.