U.S. Says California Woman Was Asked by China to Follow Taiwan Leader's Son

U.S. prosecutors say Wanying Zhang, 34, of Irvine, followed Taiwanese President William Lai Ching-te's son Lai Ting-yu and his family because Chinese officials told her to. She is charged with secretly working for Beijing without telling the U.S. Family members with less protection, officials say, can be used to pressure leaders, which alarms U.S. security officials.