Threats by President-elect Donald Trump to impose U.S. tariffs on its immediate neighbors appear to have created a split between Canada and Mexico, after Canadian officials said problems with the two countries' borders were not comparable.

The president-elect said that he would impose the across-the-board tariffs on Day 1 and that they would stay in place until Canada, Mexico and China halted the flow of drugs and migrants.

During President-elect Donald Trump’s first term, America launched an all-out trade war with China to boost US manufacturing, secure US national security interests and resolve what Trump believed was an extremely out-of-balance trade relationship.