Cans that will hold Zippo lighter fluid move through the production process at Independent Can in Belcamp, Maryland, this week. (Wesley Lapointe/For The Washington Post)

By Abha Bhattarai

Tariffs on steel and aluminum doubled to 50 percent Wednesday, adding higher costs and new uncertainty for businesses across the country that rely on metal imports for machinery, construction and manufacturing.

In the order doubling the tariffs, President Donald Trump wrote that the higher levies “will provide greater support to these industries and reduce or eliminate the national security threat posed by imports of steel and aluminum articles and their derivative articles.”

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