China’s foreign minister warned the Biden administration on Sunday to roll back former President Donald Trump’s “dangerous practice” of showing support for Taiwan, the island democracy claimed by Beijing as its own territory. The claim to Taiwan, which split with the mainland in 1949, is an “insurmountable red line,” Wang Yi said at a news conference during the annual meeting of China’s ceremonial legislature. The United States has no official relations with Taiwan but extensive informal ties. Trump irked Beijing by sending Cabinet officials to visit Taiwan in a show of support. “The Chinese government has no room for compromise,”...