Mexico, Canada and others may be exempted from US tariffs

White House press secretary Sarah Huckabee Sanders speaks during the daily briefing at the White House in Washington, Wednesday, March 7, 2018. (AP Photo/Susan Walsh)

A steel worker builds a structure in Ottawa, Ontario, Monday, March 5, 2018. President Donald Trump insisted Monday that he’s “not backing down” on his plan to impose stiff tariffs on imported steel and aluminum despite anxious warnings from House Speaker Paul Ryan and other congressional Republicans of a possible trade war. (Sean Kilpatrick/The Canadian Press via AP)

WASHINGTON — The White House said Wednesday that Mexico, Canada and other countries may be spared from President Donald Trump’s planned steel and aluminum tariffs under national security “carve-outs,” a move that could soften the blow amid threats of retaliation by trading partners and dire economic warnings from lawmakers and business groups.