Trump unveils 'Golden Dome' missile project to seal off America

Donald Trump has pledged to create a "golden dome" shield to protect the United States from foreign attacks. The Golden Dome would operate using a network of satellites and interceptors working from space to neutralise incoming threats. It won't be cheap, with the Budget Office saying the price tag could be more than triple what the Trump administration has proposed. Trump says the ambitious defence project is needed to combat advancing missile capabilities from countries like China, Russia and North Korea. But how long will the Golden Dome take to make, and how much will it cost? Here's a breakdown.