China 'seriously concerned' by Trump's 'one China' comments

China said it's "seriously concerned" after Donald Trump questioned whether the U.S. should keep its stance that Taiwan is part of the "one China" policy. Bejing warned that cooperation with the U.S. "would be out of the question" if Trump doesn't follow the "one China" policy. During a recent interview with Fox, the future president said that he doesn't feel it's necessary to abide by the policy unless a bargain is reached. Trump said.