Assume the us government just announced an imposition of 60% tariffs on imported steel from china.

Assume the us government just announced an imposition of 60% tariffs on imported steel from china. The rationale is the chinese government subsidizes their steel manufactureers and as such puts the american steel makers at a disadvantage. What is the US governments policy called? what is the Chinese governments' policy called? Why does each side engage in this policy? State and defend you position on this issue.