President Donald Trump on his first day in office Monday will issue an order defining a person’s sex as “male or female” — requiring government agencies to use the “immutable” designation on forms and IDs while also ordering changes to federal prison policies that govern transgender inmates.

“What we’re doing today is defining that it is the policy of the United States to recognize two sexes: male and female. These are sexes that are not changeable, and they are grounded in fundamental and incontrovertible reality,” an incoming White House official told reporters.

The policies are included in an executive order — one of dozens that Trump, 78, is expected to sign shortly after he assumes the presidency around noon.

The order will prevent people from changing their sex on US passports — which currently allow for holders to choose male, female or “X” — and will attempt to ban medical transition treatment for prisoners. Both new policies are likely to face litigation.

The order will require the State Department, Department of Homeland Security and other agencies “to ensure that official government documents, including passports and visas, reflect sex accurately,” the incoming official said.

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