[Nathan Zachary]

"The corridor, which runs from Mexico City through Tucson north to Edmonton, Alberta, is a federally designated "high priority" route for the movement of trade."

actually it runs to Winnipeg, Canada. I'm pretty sure Canadian truck drivers, who aren't allowed to "interstate" in the USA either, won't like Mexican truck drivers "interstating" in Canada either, or driving their delapitated unsafe trucks across the prairies, taking their jobs.

[LachlanMinnesota]

All of the trading ports in Mexico used by the Chinese and others would not be possible if the trucking industry could not easily transport to the US and Canada from Mexico.

Therefore, there will never be any retaliation, since to do so would be to ruin the stream of cash they get from having large ports which do not have the same regulations as we have in the US. It might even make some shipments be off-loaded directly into the US ports.