Trump recently said he will impose a 35% tariff on Canada, the latest salvo in his on-again, off-again trade war with the U.S. ally and top trade partner.

Canada is one of the United States' top trading partners, with more than $410 billion of goods crossing into the country last year.

Rod Stewart has hit out at US President and former friend Donald Trump during his live performance in Canada, taking aim at his threats to make the nation the "51st state"

Trump wrote to Carney to inform him that, from August 1, Canada will face a 35 percent import tariff after the two sides failed to reach a deal during the recent pause. The American leader said he would consider revising the 35 percent tariff "if Canada works with me to stop the flow of Fentanyl".

After months of intensive talks and shuttle diplomacy, a trade agreement between the European Union and the US now rests mostly on Donald Trump.

President Trump said he is cautiously optimistic about a trade deal with the E.U. ahead of a deadline.