EXCLUSIVE — A leading Republican senator on border issues has implored the Trump administration’s top homeland security officials to investigate the status of nearly a million illegal immigrants who were waived into the United States with minimal vetting and are largely untraceable.

Sen. James Lankford (R-OK) has asked White House border czar Tom Homan and Homeland Security Secretary Kristi Noem to determine the status of 810,000 immigrants who were admitted into the country under former President Joe Biden. The majority of them were not initially given a court date or legal process to follow, leaving them untraceable. This figure is in addition to the several million illegal immigrants House Republicans found were released into the country with a court date under Biden.