Trudeau, who spent the weekend in London meeting with European leaders, has vowed to retaliate should Trump follow through on his threat of hitting Canada with tariffs. Last month, he announced Canada would hit back by imposing 25 per cent tariffs on $155-billion worth of U.S. goods, but shelved those plans once an agreement to delay was reached.

Commerce Secretary Howard Lutnick said Trump will decide Tuesday afternoon whether to proceed with, reduce or postpone tariff plans that have been on hold.