Trump changes tack, backs 'one China' policy in call with Xi

By Ben Blanchard and Steve Holland BEIJING/WASHINGTON (Reuters) - U.S. President Donald Trump changed tack and agreed to honor the "one China" policy during a phone call with China's leader Xi Jinping, a major diplomatic boost for Beijing which brooks no criticism of its claim to self-ruled Taiwan. Trump angered Beijing in December by talking to the president of Taiwan and saying the United States did not have to stick to the policy, under which Washington acknowledges the Chinese position that