Tariffs of 50% have been imposed by the U.S. on approximately $20 billion worth of Canadian products. This action occurred early Saturday morning. The move follows the collapse of negotiations between the two parties.

Canada has vowed to retaliate immediately against the tariffs. The U.S. tariffs affect a significant amount of Canadian goods, totaling around $20 billion.

Further details on the tariffs and Canada's planned retaliation are available from the source. The situation is developing after negotiations between the U.S. and Canada broke down, leading to the imposition of the tariffs.