The former barrister and Shadow Justice Secretary backed the existing law, which the party fought in the last general election, and said there was “no reason to expect it is going to change”.
He said this means backing “the implementation of the Equality Act, including the single-sex exemption which allows the provision of women-only spaces”.
Starmer’s damaging stance on the matter arrives after Labour backbencher Rosie Duffield urged the leader to meet her and other female Labour MPs to discuss the party’s policy on transgender issues.
The Canterbury MP also confirmed she will not attend Labour’s annual conference, which takes place 25-29 September, due to her transphobic views.