The Transportation Department’s watchdog asked the Justice Department to criminally investigate Elaine Chao late last year after it determined she had misused her office when she was transportation secretary under President Donald Trump but was rebuffed, according to a report released Wednesday. The report said the Justice Department’s criminal and public integrity divisions declined in December to take up the case for criminal prosecution following the inspector general’s findings that Chao inappropriately used her staff and office for personal tasks and to promote a shipping business owned by Chao’s father and sisters. That company does extensive business with China. “A...