Inside the near-impossible challenge of seizing Iran's nuclear stockpile 07:24 How hard would it be to remove or destroy Iran's nuclear stockpile? President Trump has said eliminating the country's nuclear weapons capability is a key objective of his military campaign against Iran, but U.S. military experts say it would be one of the riskiest missions ever attempted.Last June, the United States significantly degraded Iran's nuclear infrastructure with massive "bunker buster" bombs designed to reach deeply buried material. But the International Atomic Energy Agency says Iran still maintains about 972 pounds of 60% enriched uranium, a short step away from the 90% enrichment levels needed for high-yield military warheads. Without a diplomatic deal to remove or destroy the stockpile, a military operation involving boots on the ground deep in Iran is probably the only option.…