President Donald Trump, who made the deportation of immigrants a central part of his campaign and presidency, said Wednesday that the U.S. will use a detention center at Guantánamo Bay, Cuba, to hold tens of thousands of the “worst criminal aliens.

Donald Trump has ordered his administration to prepare Guantánamo Bay Naval Base to house up to 30,000 “criminal aliens,” significantly expanding the government’s current detention capacity. The portion of the facility the administration plans to use currently only has capacity for 150 migrants.