The USMCA carve-out exemption allows the US to continue to import oil and other resources from Canada and Mexico tariff-free, and avoids greater disruption in the trade of key manufacturing inputs such as automotive parts. US Trade Representative Jamieson Greer, when asked about existing exemptions, said the White House was seeking “continuity” with the new tariff order, which will take effect on Feb. 24, the day Trump delivers his State of the Union speech to Congress.