US admits China poses most significant challenge amid Beijing's threat Wed, Feb 03 2021 04:28:39 PM By Ateet Sharma New Delhi, Feb 3 (IANS): A top Chinese Communist Party (CCP) Politburo Member has warned the new Joe Biden administration at the White House not to cross the "red line" and stop interference in the affairs of Hong Kong, Tibet and Xinjiang. In his first speech to an American audience since the Biden administration took office, Yang Jiechi, Director of the Office of the Central Committee for Foreign Affairs of the Politburo of the 19th CPC Central Committee, accused the previous Donald Trump administration of adopting "misguided policies against China" and plunging the relationship into its most difficult period since the establishment of diplomatic ties between both the nations.