The 71-year-old’s odd workout clothing choice caught the internet’s attention again this week after Kennedy posted a video with Defense Secretary Pete Hegseth.

Robert F. Kennedy Jr. addressed his unorthodox gym attire — jeans — in an interview with Fox News after a video of him working out with Defense Secretary Pete Hegseth went viral

Annals of Internal Medicine editor Christine Laine says she won’t retract the study, as demanded by Robert F. Kennedy Jr., and "we’re not changing what we do because of threats."

Secretary Robert F. Kennedy Jr. on Tuesday explained why he’s often caught wearing jeans during workouts. “Well, I just started doing that a long time ago because I would go hiking in the morning and then I’d go straight to the gym,

RFK Jr. hasn't completely alienated all his famous in-laws, however. Earlier this week, Chris Pratt came to the defense of the politician, whose cousin Maria Shriver is the mother of Pratt's wife, Katherine Schwarzenegger.

RFK Jr. promised to identify the causes of autism but has eliminated parts of his agency actively investigating them and has cut millions in funding for autism research.

U.S. Health Secretary Robert F. Kennedy Jr. has promised "a massive testing and research effort" to determine what he says are the environmental causes of autism. Under Kennedy's direction, however, the government recently ended funding for studies looking into some of those environmental factors.