The Department of Homeland Security, “correctly, and at a minimum reasonably, concluded that DACA is unlawful,” Justice Department lawyers wrote in a brief submitted to the Supreme Court late Monday.

The Supreme Court will begin to hear arguments in November. A ruling is expected in the presidential election year, putting the high court at the center of one of the most politically charged issues of debates. A decision in favor of Trump would allow for the president to deport more than one million young adults residing in the U.S. under DACA protection, the New York Times reported.

Deferred Action for Childhood Arrivals, or DACA, was created under an executive order in 2012. The program gives some illegal immigrants — known as “Dreamers” — who were brought to the United States as children– the opportunity to receive a renewable two-year reprieve from deportation and become eligible for a work permit.

In 2017, the Donald Trump administration announced its plan to phase out the program, but federal courts have ruled that the phase-out could not apply retroactively and that the program should be restarted.

The White House fought back on those decisions, saying the president has broad authority over immigration enforcement policy. Federal appeals courts around the country have rejected efforts by the federal government to move ahead with phasing out the Obama-era program.