While U.S. voters largely oppose the trade war with Canada, many Democrats and their supporters have protectionist leanings.

© Alex Kent/The New York Times

The prime minister’s second budget repeatedly stresses diversifying Canada’s economy away from the United States.

© Patrick Doyle/Reuters

The move is part of the Canadian prime minister’s effort to reduce American influence over Canada and expand trade to other parts of the world.

© Pool photo by Christopher Katsarov