Under a program known as CHNV, migrants from Cuba, Haiti, Nicaragua and Venezuela were allowed to fly to the U.S. after securing a sponsorship from U.S.-based individuals.

The Trump administration can’t immediately revoke the deportation protections and work permits of hundreds of thousands of migrants from Cuba, Haiti, Nicaragua and Venezuela who entered the U.S. legally under a Biden-era program, a federal judge ruled Monday.

U.S. District Court Judge Indira Talwani blocked the Trump administration from moving forward with its plan to terminate the legal status of those migrants on April 24. The administration had warned those affected by its announcement that they would need to self deport by that date or face arrest and deportation by federal immigration agents.

But Talwani suspended the deportation warnings the government had sent and prohibited officials from revoking the legal protection, known as immigration parole, that the Biden administration granted to more than half a million Cubans, Haitians, Nicaraguans and Venezuelans.