The Trump administration is considering defining gender as a biological, immutable condition determined by genitalia at birth.

A series of decisions by the Obama administration loosened the legal concept of gender in federal programs, including in education and health care, recognizing gender largely as an individual’s choice and not determined by the sex assigned at birth. The policy prompted fights over bathrooms, dormitories, single-sex programs and other arenas where gender was once seen as a simple concept. Conservatives, especially evangelical Christians, were incensed.

Now the Department of Health and Human Services is spearheading an effort to establish a legal definition of sex under Title IX, the federal civil rights law that bans gender discrimination in education programs that receive government financial assistance, according to a memo obtained by The New York Times.

The department argued in its memo that key government agencies needed to adopt an explicit and uniform definition of gender as determined “on a biological basis that is clear, grounded in science, objective and administrable.” The agency’s proposed definition would define sex as either male or female, unchangeable, and determined by the genitals that a person is born with, according to a draft reviewed by The Times. Any dispute about one’s sex would have to be clarified using genetic testing.

“Sex means a person’s status as male or female based on immutable biological traits identifiable by or before birth,” the department proposed in the memo, which was drafted and has been circulating since last spring. “The sex listed on a person’s birth certificate, as originally issued, shall constitute definitive proof of a person’s sex unless rebutted by reliable genetic evidence.”

Full story at The New York Times.