There are more than 652,800 people, including doctors fighting the coronavirus, who could be affected by the decision about the program, Deferred Action for Childhood Arrivals (commonly known by its acronym, Daca).
Daca allowed young people who were raised without legal immigration status in the US to get renewable, two-year authorizations to live and work in the country. It did not provide a path to citizenship.
Barack Obama enacted Daca in 2012. The policy landed in the court system after the Trump administration rescinded it in September 2017. Trump has repeatedly said he supports the people Daca shielded from deportation, but for nearly three years their futures have been uncertain as the policy wound through the legal system.
As of September 2019, 652,880 people had Daca, including roughly 27,000 healthcare practitioners and nearly 9,000 teachers. About 80% of the people who have it are from Mexico and nearly half live in California and Texas.
Daca is a popular policy. A month before a November supreme court hearing in the case, 53% of voters said they would oppose a decision by the supreme court to end Daca, in a Marquette University law school poll.