The Trump administration has officially announced that it is phasing out the Deferred Action for Childhood Arrivals immigration (DACA) program.
Attorney General Jeff Sessions announced Trump's decision on Tuesday.
In a tweet, the president said Congress needs to "get ready to do your job" on DACA. Trump did not signal what, specifically, what action he wants Congress to take in relation to the program.
DACA will be phased out over the next six months, leaving the fates of Dreamers in the hands of Congress, according to Sessions.
The DACA policy protects nearly 800,000 people from deportation.