Dear Leader is letting his debt to the unions cloud the realities of trade laws. I like how he threatens to go to the WTO if China retaliates. There wouldn't have been a "surge of imports", unless there was a demand for the tires made in China.
The imbalance in tire manufacturing between China and the US is more over environmental regulation than labor. China is allowed to essentially completely bypass the very expensive environmental controls that we have in the US, Britain, France, EU, and Japan. Additionally their tire industry is just taking off, and while they've bypassed the environmental control expenses, they haven't entirely bypassed the expense of a modern manufacturing facility. While in America and Britain, tires are still being routinely manufactured in factories first opened in the 1920's. Partially due to a lack of capital invested in infrastructure improvements and partially due to the significant EPA restrictions on new emissions. Competitively priced tires are regularly made in countries with higher labor costs than the US. Labor isn't the primary issue.