President Trump, as early as Friday, is expected to announce plans to end the Obama administration program that gave a deportation reprieve to hundreds of thousands of young illegal immigrants, a senior administration official told Fox News.

Trump promised to terminate the Deferred Action for Childhood Arrivals program, or DACA, during the presidential campaign — but since taking office had left the door open to preserving parts of it.

According to the official, Trump is expected to announce the program’s end but will allow so-called “dreamers” currently in the program to stay in the U.S. until their work permits expire – which, for some, could be as long as two years.

The program, also known as DACA, was formed through executive order by then-President Barack Obama in 2012 and allows for certain people who came to the U.S. illegally as minors to be protected from immediate deportation.