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The levy, along with an import price floor, will go into effect Dec. 4, per a proclamation the president issued Thursday.

Published Aug. 7, 2026

President Donald Trump speaks to the media after signing an executive order in the Oval Office at the White House on Aug. 3, 2026, in Washington, D.C. Trump said a new 15% tariff on polysilicon imports was needed to reverse the erosion of U.S. manufacturing capacity.

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