“Quite simply, imports of beer taps are not relevant to this section 301 dispute, and imposition of tariffs on tap handles under section 301 is not appropriate and will not further USTR’s goals. Moreover, by proposing to impose tariffs on such a large volume of imports into the United States, USTR has ensured that the section 301 tariffs will hurt U.S. businesses, including small-to-medium size businesses such as Taphandles.”