Donald Trump has halted a plan to double US tariffs on Canadian steel and metal imports to 50%, just hours after first threatening them.
Tariffs of 25% are still going ahead and will take effect from the 12 March.
The move by the president comes after the Canadian province of Ontario suspended new charges of 25% on electricity that it sends to some northern states in the US, hours after Trump threatened to sharply increase his tariffs on the country.
It marked the latest skirmish in a trade war that risks economic damage to the two North American neighbours.