The administration argues that relying on imported metals could reduce demand for American-made materials, leaving the US with less domestic production and fewer critical supplies in the event of a national emergency.
And because brass instruments are made mostly from copper and zinc, they have been swept into the same net as fire extinguishers, floor safes, electrical cables, welding-machine parts, and tanker trailers.
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Article on this from Reason Magazine, the only major-ish outlet that’s reported on this so far. In fact, it looks like they originated this story: https://reason.com/2026/08/05/trumps-newest-tariffs-could-protect-america-from-the-national-security-risk-of-brass-instruments/