The White House said Wednesday that President Donald Trump would press ahead with controversial tariffs on steel and aluminum by the end of this week. It confirmed, though, that some countries — including Mexico and Canada — could get carve-outs exempting them from the trade penalties.

White House Press Secretary Sarah Huckabee Sanders said, that decision is based on "national security." She added that it's possible other countries could receive the exemptions as well. Those choices would be made on "a case-by-case, country-by-country" basis.

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