It would be good if at least some of the news stories on the tire tariffs gave a bit of background. When China was admitted to the WTO it agreed to allow the United States to impose tariffs to temporarily counteract the disruptive effects of an import surge. The agreement did not require the United States to show that China had in any way acted unfairly, simply that the growth of imports had seriously disrupted the domestic market. This clause was an important factor in selling China's entry to the WTO to interest groups in the United States. Therefore, it should not be surprising that the government would occasionally take advantage of a clause that it had demanded.
--Dean Baker