President Trump has gotten off to a rocky start with one NAFTA partner — Mexico. On Monday, he turns to the other partner, Canada, when he hosts Prime Minister Justin Trudeau at the White House. Hundreds of billions of dollars of trade pass between Canada and the U.S. each year, $540 billion in 2015 alone. Yet Trump has called NAFTA the worst trade deal ever and is threatening to rip up or at least renegotiate it. Mark Manger , an associate professor at the University of Toronto's Munk School of Global Affairs, says NAFTA is not as contentious an issue in Canada as in the U.S. He says the trade deal has helped provide a lot of jobs, many in the auto industry, and that Canadians worry about what Trump has in mind. "There's a very genuine fear in Canada, and I think Canadian auto workers in particular are very worried about it. We're talking about over 100,000 jobs here in Canada that are essentially in the auto industry," he says. Ford, Chrysler and GM are among the U.S. automakers that