President Donald Trump's threats to impose punishing tariffs on Canada and Mexico may be part of a strategy to gain leverage ahead of new negotiations on a regional trade agreement, experts said.

As U.S. President Donald Trump mulls imposing 25% duties on imports from Canada and Mexico on Feb. 1, focus has shifted to the sectors likely to bear the brunt of the tariffs. About 28%, or about $844 billion,

While much about the threatened tariffs is still unclear, experts predict they would be bad news for all three economies, with few winners.