Donald Trump announced Thursday the U.S. will charge a 35 per cent tariff on Canadian imports starting Aug. 1. In an open letter to Prime Minister Mark Carney that was posted on Truth Social, the U.S. president wrote “if for any reason you decide to raise your Tariffs, then, whatever the number you choose to raise them by, will be added onto the 35% that we charge.” Trump claimed the tariffs were originally imposed on Canada because of the U.S. fentanyl crisis, which he said were partly due to “Canada’s failure to stop the drugs from pouring into our country.” “If Canada works with me to stop the flow of Fentanyl, we will, perhaps, consider an adjustment to this letter,” Trump wrote. “These Tariffs may be modified, upward or downward, depending on our relationship with your Country.” Late Thursday night, Carney posted on social media that Canada would work towards a revised deadline of Aug. 1 in reaching a new trade deal with the U.S., updating the July 21 deadline set last June...