Carney, Mexico's Sheinbaum agree to start working more closely together in face of U.S. tariffs

Open this photo in gallery: National flags representing Canada, Mexico, and the U.S. are lit by stage lights at the North American Free Trade Agreement, NAFTA, renegotiations, in Mexico City, on Sept. 5, 2017.Marco Ugarte/The Associated Press Prime Minister Mark Carney and Mexican President Claudia Sheinbaum have agreed to immediately start working more closely in the face of U.S. President Donald Trump's tariffs and the looming renegotiation of the pact that governs continental free trade. So far, Canada and Mexico do not appear to have co-ordinated much on the file, despite suffering the same attacks in Mr. Trump's trade war…