The Deferred Action for Childhood Arrivals was an executive action taken by President Barack Obama that allowed undocumented immigrants who came to the U.S. under the age of 16 to apply for protection from deportation. After a background check, those individuals were able to get renewable two-year permits to work and study in the U.S., as well.

The Trump administration said that this program was beyond the power of President Obama and said that the program would be terminated with a six-month window back in September of last year.

Trump’s decision has been challenged in court, and DACA has become a negotiating point.