Laura Rosenberger, President Joe Biden’s top adviser on matters related to China and Taiwan, will step down in March, Bloomberg reported Wednesday, citing White House officials. Rosenberger serves as a special assistant to the president and senior director on the National Security Council and has guided the president amid Washington’s increasing tensions with Beijing and will see out her term as the administration grapples with fallout from the shooting down of a Chinese spy balloon in America’s coastal waters on Feb. 4. However, Rosenberger’s plans to step down preceded the balloon invading U.S. airspace and sparking bipartisan concern in Congress...