Article:
https://www.nytimes.com/2019/08/29/us/immigrant-medical-treatment-deferred-action.html
Cliffs: Without any public announcement Trump admin removes a 'deferred action' program that allows people who themselves or who's immediate family are undergoing life saving treatment to remain in the country to continue it. This affects about 1,000 people a year, including kids with sickle cell anemia and cancer. Under the new policy you can still conceivably apply for deferral through ICE though letters indicate you'll only be considered if you are a member of the military. There is no process of appeal if your deferral is rejected.
Dear Maria,
After careful consideration of your situation I'm afraid we're going to have to earmark you for death. Sorry for the inconvenience.
Yours sincerely,
Anne Odious cnut