On June 12, the Trump Administration overturned an Obama Administration interpretation of Section 1557 of the Affordable Care Act, which protected individuals who are transgender from discrimination in health care.
Here's how HHS put it: "Under the final rule, HHS eliminates certain provisions of the 2016 Rule that exceeded the scope of the authority delegated by Congress in Section 1557. HHS will enforce Section 1557 by returning to the government's interpretation of sex discrimination according to the plain meaning of the word 'sex' as male or female and as determined by biology. The 2016 Rule declined to recognize sexual orientation as a protected category under the ACA, and HHS will leave that judgment undisturbed."