WASHINGTON —

President Donald Trump doubled tariffs on foreign-made steel and aluminum to 50%.

In a proclamation Tuesday , the White House said the tariffs would end "unfair trade practices" and threats that would "impair national security," while encouraging American companies to invest in domestic plants.

"He's delivering on his promises to bolster our steel and aluminum industries in this country and to protect jobs," White House Press Secretary Karoline Leavitt said.

But some economists warn that the tariffs could spike prices, impacting cars, auto parts, grocery packaging like canned foods, and construction and transportation building materials.

According to government data, steel prices are up 16% since Trump took office , costing more than double what they do in China and o

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