President Trump’s threat to impose national security tariffs on vehicle imports risks disrupting the supply chains of more than a fourth of the U.S. automotive industry, costing American workers high-paying jobs and further fraying longstanding alliances, Europe warned the White House on Monday.

Trade-restrictive measures would make U.S. carmakers less competitive, “weaken the U.S. economy and reduce its innovation potential,” a delegation from the European Union trading bloc wrote in comments submitted for an investigation the Commerce Department is required to conduct before imposing duties under Section 232 of the Trade Expansion Act of 1962.

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