section 1557, original source link, call to action
Here's the exact language that was changed according to HHS: https://www.hhs.gov/about/news/2020/06/12/hhs-finalizes-rule-section-1557-protecting-civil-rights-healthcare.html
A good summary of the impact: https://www.npr.org/sections/health-shots/2020/06/12/868073068/transgender-health-protections-reversed-by-trump-administration
This will not go into effect for at least 60 days. If you can, please call your state and federal electeds to raise visibility and help them fast track relevant legislation to block this.