US President Donald Trump’s Golden Dome missile defence shield will cost as much as US$1.2 trillion to deploy and operate, six times above current forecasts, according to a new estimate – and would still probably fail to stop an all-out attack. The new forecast from the non-partisan Congressional Budget Office relies on capabilities spelled out in Trump’s January 2025 executive order unveiling the idea rather than any government plan because the administration has given no details about what the...