Biden requests Mehmet Oz and Herschel Walker resign from presidential council or be terminated

(CNN) President Joe Biden has formally asked two Trump-appointed members of the President's Council on Sports, Fitness & Nutrition to resign from their posts or be terminated.

It's against the Biden administration's policy for federal candidates to serve on presidential boards, according to a White House official. The official said letters to Oz and Walker were sent Wednesday requesting their resignations by 6 p.m.

Oz, who's seeking the GOP nod in a contentious primary , blasted the move in a statement. "President Trump appointed me to two terms on the President's Council on Sports, Fitness & Nutrition. The White House just emailed me demanding my resignation by the end of the day," he wrote. "Clearly, Joe Biden can't be around anyone who doesn't completely fall in line with his fear-mongering authoritarian one-size-fits-all COVID handling. I am proud of my service and will not resign."

CNN has reached out to Walker's campaign for comment.