The details of his job in Donald Trump’s next administration have been contested, but Robert F. Kennedy Jr. has been angling for a major role overseeing federal health agencies. Kennedy said last week that Trump has promised him control of the Food and Drug Administration, the Department of Health and Human Services, the Department of Agriculture, and others, Salon reports. Kennedy has brought up being “White House health czar.” That sort of job has caused concern because of his anti-vaccine stances. On Wednesday, Kennedy offered reassurance. “I’m not going to take away anybody’s vaccines,” he…