The policy passed by the Obama administration in 2016 makes it possible to prohibit healthcare providers and insurers who receive federal money from denying treatment or coverage to anyone based on sex, gender identity, or termination of pregnancy.
It also required doctors and hospitals to provide "medically necessary" services to transgender people, as long as those services were the same ones provided to others.
In the coming weeks or months, the Department of Health and Human Services is expected to come up with a new policy that would allow doctors and hospitals to deny treatment to trans people and women who have had an abortion.
ACLU and Lambda Legal have expressed their concern and at the same time their lack of information.
"We are deeply concerned," said Sasha Buchert, a staff attorney at Lambda Legal. "The Department of Justice has already shown its hand... We stand ready to respond."
"I don’t think they are going to have an easy time … and we’ll make sure they hear every objection and justify what they’re doing," said Joshua Block, a senior staff attorney at the ACLU.