The president on Saturday threatened to revoke comedian Rosie O'Donnell's U.S. citizenship, something he cannot legally do.

Trump threatens to revoke born-in-USA Rosie O’Donnell’s citizenship and calls her ‘Threat to Humanity’ - Comedian O’Donnell moved to Ireland days before Trump took office for second term

Federal judge in New Hampshire stayed the order for seven days to allow the Department of Justice to appeal. He called birthright citizenship "the greatest privilege that exists in the world."