Canada and Mexico are expected to intensify efforts this week to avoid punishing 25% tariffs on their exports to the U.S. in talks to persuade President Donald Trump's administration that their steps to increase border security and curb fentanyl trafficking are working ahead of a March 4 deadline.

President Trump announced a 25% tariff on nearly all imports from Mexico and Canada on Feb. 1, but then put them on hold until March 4, using the threat as