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Washington, March 25 (IANS) Top American lawmakers and experts have warned that the country's heavy reliance on foreign critical minerals, especially those from China, poses a direct threat to national security, and called for urgent steps to build resilient domestic supply chains. At a House subcommittee hearing on Wednesday, Congressman Paul Gosar said the “very security of our nation relies heavily on a steady input” of minerals essential for defence systems, electronics and advanced technologies. He pointed to copper, rare earths and lithium as key inputs for fighter jets, missiles and batteries. Gosar warned that the US remains heavily reliant…