The U.S. economy has never been more integrated with Canada and Mexico. The 25% tariffs that President Trump has said he would impose on America’s two largest trading partners on Tuesday could upend those relationships—and no sector is as exposed as the automotive industry.

Mexican President Claudia Sheinbaum says she hopes to speak with U.S. President Donald Trump now that he has announced plans to impose tariffs on Mexico and Canada starting Tuesday.

Trump backed down from his threats to slap 25 percent tariffs on all imports from Canada and Mexico earlier this month, but at the time, he said those tariffs were merely delayed by 30 days. On Thursday, Trump posted on Truth Social that the tariffs on Canada and Mexico would be imposed on March 4 (along with more tariffs on imports from China).