DETROIT (AP) — If Canadian Auto Workers go on strike against Detroit’s three automakers next week, the impact will be felt quickly in the U.S.

Negotiations between the CAW and Chrysler, General Motors and Ford have hit a rough patch with less than a week to go before contracts expire on Monday night. The companies are trying to cut costs and the union is refusing their demands for concessions. On Wednesday, the union told workers to prepare for a strike and said negotiations haven’t been going well.