Prime Minister Mark Carney is attempting to prevent 50 percent tariffs against many Canadian goods scheduled for this month.

© Chris Helgren/Reuters

The legislation was championed by Senator Lindsey Graham, the South Carolina Republican whose sudden death last month helped spur quick action on it.

© Tierney L. Cross/The New York Times

Canada’s prime minister laughed off Trump’s description of Canada but suggested that trade talks between the two countries are acrimonious.

© Sammy Kogan/The Canadian Press, via Associated Press