OTTAWA — Conservative Leader Pierre Poilievre said trade with China is no substitute for trade with the United States and Canada should build on its leverage to secure a tariff-free trade deal with our neighbour to the south. “Canada’s prosperity and security are inseparable from a stable relationship with the United States,” said Poilievre, during a speech at the Economic Club of Canada in Toronto on Thursday. “That is why we should not declare a permanent rupture from our biggest customer and closest neighbour in favour of a strategic partnership for a new world order with Beijing...