The Department of Homeland Security has abruptly halted a Biden administration program that allowed hundreds of thousands of migrants outside the United States to bypass normal immigration protocols and fly into the country amid serious allegations of fraud.

The DHS has suspended the “CHNV” program following a report by the Federation for American Immigration Reform, which found that an internal government audit documented a large number of fraudulent applications as the U.S. admitted nearly half a million migrants from four countries.