A new government report released Tuesday night found more than half a million foreign nationals who received temporary visas to enter the U.S. under the Visa Waiver Program or B Visa in 2015 overstayed their permits.

A total of 527,127 people visiting the U.S. through both programs failed to leave and have remained in the country without legal status or lawful presence. According to the report, more than 90 percent of those who remained in the country illegally, a total of 482,781, were believed to still be present through the end of last year, according to Department of Homeland Security data.