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.

As traders worldwide wait to see if U.S. President Donald Trump once again holds off on putting new tariffs on Canada and Mexico, the head of the U.S. Treasury Department has highlighted one potentially promising avenue for America’s neighbors.