The U.S. government can use a number of different WTO-approved mechanisms to reduce or block imports from another country. If it finds that a country has been selling goods at “less than fair value,” it can pursue a dumping investigation. If it finds that a country has been illicitly subsidizing its exports, it can take up a countervailing duty case. Those are the two most common approaches, and each involves a two-stage investigation. First, the U.S. International Trade Commission (USITC) determines whether the domestic industry has been injured. Second, the Commerce Department assesses the extent of the exporting country’s violation—the dumping margin or the size of the subsidy. In the end, tariffs may be applied.
Remember the steel fiasco? The dumpers can just appeal as Bush did with the steel industry. Of course this isn’t as big as the steel industry which is heavily protected.
How long do you suppose that takes? - My guess - just long enough to be ineffectual.