For aluminum, the U.S. is more heavily reliant on imports. Roughly half of all aluminium used in the U.S. is imported, with the vast majority coming from Canada. At 3.2 million tons last year, Canadian imports were twice those of the next nine countries combined.

Iron ore fell to its lowest level since early May alongside equity markets after President Donald Trump said he would double tariffs on steel and aluminum to help protect American workers.

President Donald Trump travels to Pittsburgh Friday to celebrate a deal he once vowed to oppose - Japanese steelmaker Nippon Steel’s long-announced plans to buy iconic American steelmaker US Steel.

South Korea's Industry Ministry said on Monday it will respond to the looming 50% U.S. tariff on steel products as part of its trade discussions with Washington in order to minimise the impact on industry.

National Economic Council director Kevin Hassett told ABC's "This Week" that President Trump is focused on ensuring the U.S. has a domestic steel industry capable of supplying its needs "China is dumping of steel not just because they love us and they want to give us nice steel,

President Trump’s plan to double tariffs on foreign steel and aluminum could have sweeping effects on projects across Maryland.

Mr. Trump celebrated what he calls a partnership between U.S. Steel and Japan-based Nippon on Friday, sharing details about commitments in the partnership and increased tariffs on imported steel.

President Trump is launching a new trade war, this time targeting steel, raising the tariffs from 25 percent to 50 percent. CNBC Senior Analyst, Ron Insana and James Sample, a law professor at Hofstra University,