Trump says U.S.-China relationship must improve

By Emily Stephenson DES MOINES, Iowa (Reuters) - President-elect Donald Trump said on Thursday the United States needed to improve its relationship with China, which he criticized for its economic policies and failure to rein in North Korea. "One of the most important relationships we must improve, and we have to improve, is our relationship with China," Trump told a rally in Iowa. The United States and China are the world's two biggest economies.