The U.S. Supreme Court has allowed the Donald Trump administration to suspend a Biden administration program that allowed over 500.000 illegal immigrants from Cuba, Haiti, Nicaragua and Venezuela to live and work temporarily in the United States.

If previous rulings are counted, nearly a million illegal immigrants are legally “up in the air” and at risk of deportation.

It was the second time in May that the Supreme Court stood in favor of Trump’s efforts to revoke the temporary legal status of immigrants. In an earlier ruling, the Court had allowed the administration to revoke another temporary program that provided work permits to hundreds of thousands of Venezuelan immigrants.

That ruling was issued in a fast-track proceeding after the U.S. government appealed the temporary blockade by a judge in Boston.

CNN points out that this is not the final decision of the Court. The case will be heard in lower courts, but will allow the government to expedite deportations of those who had previously benefited from the program.