President Donald Trump says that the U.S. will use a detention center at Guantanamo Bay to hold tens of thousands of migrants who can’t be sent back to their home countries.

President Donald Trump said Wednesday that he is directing the opening of a detention center at Guantanamo Bay to hold up to 30,000 immigrants who are living illegally in the United States. People who are in the United States illegally and are accused of theft and violent crimes would have to be detained and potentially deported even before a conviction.