On January 11, 2010, Tsai Ing-Wen won the reelection with a high margin of 8.17 million votes, which evidenced her public support with her US-China policies in the past four years. At the same time, COVID-19 broke out in China, and swept across the globe, thus worsening the US-China relationship. For his reelection campaign, Donald Trump toughened the policies against China, strengthened the relation with Taiwan, and sent senior officials to visit Taiwan. As a result, the cross-strait tension has become more intense. Donald Trump lost his election to Joe Biden, who inaugurated on February 21, 2021. Besides maintaining the same policies towards China, Joe Biden even united other countries to oppose China.