The Globe and Mail reports in its Saturday edition that Canada and the United States have agreed to begin comprehensive negotiations on a new economic and security relationship following next month's election, Prime Minister Mark Carney said Friday. A triple-bylined item led by Steven Chase says this followed a call between the Prime Minister and U.S. President Donald Trump -- the first time the two have talked since Mr. Carney took office on March 14. This agreement paves the way for talks between Mr. Trump and whoever is prime minister after the April 28 election. The trade dispute, along with Mr. Trump's repeated suggestion that Canada become the 51st state, has overshadowed the Canadian campaign. The Prime Minister's Office acknowledged Mr. Carney must win a mandate first. Mr. Trump described the conversation as "extremely productive." Speaking at a Liberal campaign stop Friday in Montreal, Mr. Carney said the scale of Mr. Trump's efforts to reset American trade relations require a new deal between Canada and the U.S. Mr. Trump, who wants to use tariffs to force companies to relocate to the U.S., has already caused economic damage and job losses in Canada by imposing 25-per-cent tariffs on steel and aluminum imports.