Trump’s promise to impose 30% tariffs on imports from Mexico and 35% on imports from Canada beginning tomorrow could hammer up to three-fourths of their U.S. imports.

Commerce Secretary Howard Lutnick reminded us of an important but little-discussed part of trade negotiations with Canada and Mexico -- "virtually 75%" of trade between the U.S. and its two neighbors is "already tariff free" because of the USMCA agreement.

US President Donald Trump on Thursday signed an executive order increasing tariffs on Canadian goods to 35% from 25% on all products not covered by the US-Mexico-Canada trade agreement, the White House said.