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In an appearance on Fox News Sunday, US President-elect Donald Trump questioned whether the United States should keep its long-standing one-China policy. This came just a few days after Trump’s tradition-breaking call with Taiwan leader Tsai Ing-wen, alarming both Beijing and the White House. How ugly can a China-US trade war get - and is Trump's rhetoric worse than his bite? We're joined by Yang Xiyu from the China Institute of International Studies, Joel Rubin, a former Deputy Assistant Secretary of State, and Professor Robert Ross from Harvard University.