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.

The Migrant Operations Center is used for people intercepted trying to illegally reach the U.S. by boat. Most are from Haiti and Cuba.

Guantanamo Bay has drawn worldwide condemnation over the alleged torture and abuse of detainees on the US base, and previous presidents have sought to shut the facility down.