President Donald Trump said tariffs scheduled to hit Canada and Mexico next month were “on time” and “moving along very rapidly” following an initial delay, even as a US official cautioned the schedule could be less certain.

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.

Trump also plans to impose new tariffs to match the rates charged by other countries. Set to begin as soon as April, the tariffs could be higher than what other countries would charge as subsidies, regulatory barriers and the value added tax — which is akin to a sales tax common in Europe — would be included in the calculations.