Texas Deputy Attorney General Aaron Reitz is walking back his comments slamming Simone Biles as a "national embarrassment," admitting he wasn't "adequately versed" on the subject before weighing in.

Reitz, in a tweet he has since deleted, slammed the gymnast as a "selfish, childish national embarrassment" after she withdrew from team competition at the Olympics to take care of her mental health, CBS News reports. But he soon walked that statement back, in a follow-up tweet saying he owes her a "big" apology.

"In a moment of frustration and disappointment, I opined on subjects for which I am not adequately versed," Reitz wrote. "That was an error. I can't imagine what Simone Biles has gone through."