USTR Greer Says U.S. Economic Relationship With China Is Stable; We Are Not Looking For A Massive Confrontation With China; U.S. Looking To Maintain Stable Relations With China With Trump-Xi Meeting; Looking At Board Of Trade Mechanism In Dealing With China; Not At Point Where U.S. Can Talk About Investment Programs With China; We Always Talk About Rare Earth Minerals; U.S. Making Strides In Domestic Self-Sufficiency On Rare Earths; Need Some Kind Of Price Mechanism On Rare Earth Minerals