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President Donald Trump on Thursday signed an executive order that imposes a 25 percent tariff on steel imports and a 10 percent tariff on aluminum.

The tariffs will become effective in 15 days, with exclusions for Mexico and Canada while North American Free Trade Agreement (NAFTA) negotiations are under way.

“A nation that does not protect prosperity at home cannot protect its interests abroad,” the president said before signing the order. “When it comes time where our country can’t make aluminum and steel, you almost don’t have much of a country.”

Ron Davis, a steelworker at ArcelorMittal’s Conshohocken, Pennsylvania, mill thanked Trump, explaining that steel imports have led to closed mills across the country and threatened America’s domestic capability to produce metals essential to infrastructure and the military.

Davis revealed that in 2009 his plant was the largest supplier of armored plate to the U.S. military, but due to imports, the plant will be idled in September, which will lead to the loss of many jobs.

"At one time our plant had 400 members. We're going to be down to about 71. So, these tariffs definitely have an impact. Maybe not for our plant, but for the other plants out there," Davis said.

Watch more above, and see Trump's full speech below.

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