“The Government is directed not to remove any member of the putative class of detainees from the United States until further order of this Court,” the Supreme Court’s order said.

Justices Clarence Thomas and Samuel Alito dissented from the court’s order.

The ACLU had alleged in its court filings that the Trump administration had notified multiple migrants in the Bluebonnet Detention Center in Anson, Texas, that they were subject to the Alien Enemies Act, and feared deportations would begin quickly.

The Alien Enemies Act of 1798 authorizes the rapid deportation of migrants from countries the U.S. is at declared war with or who are attempting an invasion. President Donald Trump invoked the Alien Enemies Act on the Venezuelan gang Tren de Aragua, declaring an invasion by them, and deported a group of Venezuelan nationals to a prison in El Salvador last month.

Since Trump’s invocation of the act, there have been various legal battles over the administration’s actions. The Supreme Court ruled weeks ago that the Alien Enemies Act may be used to deport Tren de Aragua members for now but that all who could be removed were subject to notice and due process.

COURT PAUSES BOASBERG’S CONTEMPT PROCEEDINGS IN TRUMP ALIEN ENEMIES ACT CASE

In two jurisdictions, the Southern District of Texas and the Southern District of New York, federal judges have halted the use of the Alien Enemies Act pending hearings by those respective courts.

The Trump administration has exercised various unorthodox methods for its mass deportation and border security plans since returning to office in January. Last week, the president authorized the military to occupy federal lands along the southern border in three states.