An LGBT group has cut ties with tennis great Martina Navratilova after she said it was a form of "cheating" for transgender women to be allowed to compete in women's sport.
New York-based Athlete Ally, which supports LGBT sportspeople, called the comments transphobic and removed the 18-time Grand Slam winner from its advisory board and as an ambassador.
Navratilova wrote in The Sunday Times that it was "insane" that transgender athletes who "decide" to become female had achieved honors "that were beyond their capabilities as men."
"Martina Navratilova's recent comments on trans athletes are transphobic, based on a false understanding of science and data, and perpetuate dangerous myths that lead to the ongoing targeting of trans people," Athlete Ally said in a statement.
"Trans women are women, period. They did not decide their gender identity any more than someone decides to be gay, or to have blue eyes," the group added.
"They are women, and want to compete in the sport they love, just as any other athlete would."