June 4 (UPI) -- The United States' 50% tariffs on metals imported from nearly all nations took effect on Wednesday.

President Donald Trump signed an executive order on Tuesday, doubling the tariffs on all aluminum and steel imported into the United States from 25% to 50% with only Britain receiving a reprieve as part of a trade deal between the two nations in May.

"In my judgement, the increased tariffs will more effectively counter foreign countries that continue to offload low-priced excess steel and aluminum in the United States Market and thereby undercut the competitiveness of the United States steel and aluminum industries," Trump said in the order.

Roughly 25% of all steel used in the United States is imported from abroad, with neighbors Mexico and Canada serving as the largest exporters of steel into the country.

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