The United States may see further sovereign rating downgrades if it fails to improve its debt service capability, although a near-term cut looks unlikely, the head of Chinese credit rating firm Dagong said. Beijing-based Dagong Global Credit Rating Co grabbed the media spotlight in October by cutting the U.S. rating by one notch to A-minus from A, despite a deal by Congress to raise the government's borrowing ceiling. "Our rating could be effective for some time. We won't cut the rating at will," Guan Jianzhong, chairman of Beijing-based Dagong, told Reuters in an interview. "We are very worried about the U.S. ... (full story)