U.S. manufacturers are sounding worried about the Trump administration’s trade policies ahead of a hotly anticipated announcement on tariffs that’s expected from the White House on Wednesday.

Makers of chemical products, electronics, metals, machinery, foods and transportation equipment all expressed concerns about tariffs in Tuesday’s manufacturing purchasing managers index from Institute for Supply Management (ISM), a monthly business survey.

The survey showed manufacturing activity contracting in March, continuing a 26-month downward trend after expansions in January and February.

“Customers are pulling in orders due to........

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