Caitlyn Jenner has criticised trans golfer Hailey Davidson and said they were a 'mediocre male player' before changing genders.
Davidson recently won the NXXT Women's Classic near Orlando, Florida, having been born as a man.
They have now moved one step closer to earning a spot on the Epson Tour as a result of her achievement.
And Jenner, writing for the Daily Mail, has now criticised the golfer while expressing a belief trans athletes should be banned from participating against biological women.
Caitlyn Jenner has taken aim at trans golfer Hailey Davidson
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"Davidson was never so dominant as a male athlete," she wrote.
"I have had several off-the-record conversations with people in the competitive golf world, including those with the PGA, LPGA, LIV, Aramco, ownership groups and sponsors.
"Their private feedback is overwhelmingly consistent.
"Davidson was a mediocre male golfer, who never had a real chance at making it in the PGA.
"But now Davidson is in the running for one of the most highly coveted spots in women's sports.
"How is that fair to women?"
She continued: "Why can't Davidson, who earned a college scholarship as a male athlete, compete against men?
"The telling answer that some trans athletes in the golf world – and beyond – will never admit is that they'd never make that cut.
"Davidson has become illustrative of what many trans people and allies dread - a seemingly self-centered individual who is not thinking about the consequences of their actions and may, in fact, cause harm to others.
"Finally, I ask the LPGA: isn't time you admit that you've made a misstep?"
Jenner also feels that, as a trans woman, she's got the grounds to weigh in on such a divisive issue.
"As the world's greatest athlete at 26 years old, a lifelong news and sports commentator, and the patriarch of one of the world's most famous families, I have a duty to add my voice to the furious, evolving debate over transgenderism and elite athletic competition," she stated.
"This divisive issue has exploded yet again as 30-year-old Davidson is vying to earn a spot on the LPGA tour after winning the NXXT Women's Classic last week.
"Today, far too many are afraid to speak out at all for fear of cancellation or retaliation.
"Well, I am not afraid – and my perspective, humbly, can cut through so much noise.
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"When I competed in the Olympics, my competition was all I thought about.
"I deeply respected and, of course, devoted every fiber of my being to defeating them on a level playing field.
"But, respectfully, Davidson (who asks to be addressed with they/them pronouns) cannot claim to compete with that same esprit de corps.
"I am a transgender person who picked up the game of golf in my 50s, playing as an amateur, non-competitively, alongside men and women of all ages.
"I know for certain that there are physical differences between men and women that cannot be erased by modern medicine – especially after individuals go through male puberty.
"And Davidson, who began gender transition in their early 20s and underwent gender reassignment surgery six years later, is stronger than the rivals."
Caitlyn Jenner has criticised trans women and feels they shouldn't compete against biological women
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Jenner proceeded to say that governing bodies, not just in golf, must take action to prevent trans athletes from competing against biological women.
"The LPGA's ill-fated decision set it down a slippery slope," she said.
"More opportunities are likely to be taken away from women, further undermining the mission of the LPGA and casting a negative light on transgender people.
"This is not about one person, one governing body or one sport.
"This is a simple issue of fairness… and integrity.
"Golf should lead the way."