Liz Truss will propose new laws this week that will seek to prevent children from attempting to change their gender by banning access to hormone therapy.
Following feedback from constituents, the South West Norfolk MP is among 20 backbench MPs selected to bring forward the private members' bill.
Legislation will include a bid to stop under-18s accessing hormone therapy and prevent the state from recognising social transitioning by those who are not adults.
Sources close to Ms Truss told the PA News Agency that she felt more needed to be done to stop under-18s “making irreversible decisions about their bodies which they might come to regret”.
The draft proposal from the prime minister and 19 other Tory MPs will also look to protect single-sex spaces.
Under the new laws, transgender women, who have transition from being a man, would be unable to access areas such as female toilets and changing rooms.
The former prime minister was the 18th name selected in the ballot last month, meaning there is no guarantee that her Bill will be debated in the Commons.
The source added: “In her time as minister for women and equalities, Liz successfully blocked dangerous plans to allow gender self-ID.
“It has become increasingly clear there is a need for the law to better protect children and teenagers from making irreversible decisions about their bodies which they might come to regret.
“The law also needs to be amended in order to make it clear that biological males should be legally excluded from having access to single-sex spaces designated for women, including toilets, changing rooms, refuges and prisons.
“Liz decided to put forward these proposals after considering the amount of correspondence she receives on these issues and taking soundings from her South West Norfolk constituents.
“These are not party political issues and she hopes to bring together a broad cross-party alliance in support of her Bill.”
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