A group of migrants the Trump administration sent to a mega-prison in El Salvador earlier this year must now have an opportunity to challenge their removal under the Alien Enemies Act, a federal judge ruled Wednesday.

A judge is ordering the Trump administration to give the hundreds of migrants deported to El Salvador in March the right to challenge their detentions.

A federal judge on Wednesday ruled migrants sent to a mega-prison in El Salvador on flights in mid-March must be allowed to challenge their removal under the 1798 Alien Enemies Act.