The US Supreme Court on Monday allowed President Donald Trump to enforce the Enemy Alien Act for now, granting the White House a major victory that will allow immigration officials to rely on a 1798 law that traditionally had only been used in times of war to immediately deport gang members.

The court granted the government’s request to overturn U.S. District Judge James Boasberg’s ruling, which on March 15 had temporarily blocked direct deportations based on Trump’s invocation of the “Foreign Enemies Act” while legal proceedings in the case continue.

The court emphasized that going forward, people who are deported should receive notice that they are subject to the act and an opportunity to have their removal reviewed by the federal court in which they are being held.

The court’s three liberal justices dissented from the ruling, and Judge Amy Connie Barrett, a member of the court’s conservative wing, dissented in part.

Trump praised the ruling in a post on Truth Social, writing in all caps that it was “a great day for justice in America.”

“The Supreme Court has affirmed the rule of law in our nation, allowing a President, whoever he is, to be able to secure our borders and protect our families and our country itself,” he wrote.

Trump invoked the Foreign Enemy Act on March 15 to quickly deport alleged members of the Tren de Aragua gang, seeking to speed up removals using a law best known for its use to incarcerate Japanese, Italian and German immigrants during World War II.