That would be bad news for the Port of Portland, which last year moved nearly 1,000 vehicles per day. Portland is the leading West Coast exporter of U.S.-made vehicles and among the leading importers of vehicles manufactured in Japan, Korea and Mexico. (A tariff on imports would likely lead to other countries putting tariffs on U.S.-made vehicles, hurting exports.) An economic study done for the port found that vehicle operations provide at least 600 family wage jobs at the the port.