US Trade Representative Ron Kirk announces a World Trade Organization(WTO) dispute against China challenging China's export restraints on raw material inputs on June 23, 2009, at the US Trade Representative offices in Washington, DC. The materials at issue were bauxite, coke, fluorspar, magnesium, manganese, silicon metal, silicon carbide, yellow phosphorus, and zinc -- key inputs for numerous downstream products in the steel, aluminum, and chemical sectors across the globe. China is top global producer of these materials. "We are going to the WTO today to enforce our rights, so we can provide American manufacturers with a fair competitive environment and put more American workers back on the job," Kirk said.