The federal E-Verify system is supposed to help employers determine whether their workers are legal, but its use isn't always required.

Nearly 500 people, most of them South Korean nationals, were detained after federal agents descended on a sprawling site where Hyundai makes electric vehicles.

Nearly 500 people, most of them South Korean nationals, were detained after federal agents descended on a sprawling site where Hyundai makes electric vehicles.

Several hundred workers, most of them South Korean nationals, were detained at the construction site of a sprawling electric vehicle battery plant on Thursday.

Speaking on CNN's 'State of the Union,' White House border czar Tom Homan said the administration would intensify the focus on workplaces.

The federal E-Verify system is supposed to help employers determine whether their workers are legal, but its use isn't always required.

The immigration raid on a Hyundai plant last week could leave other companies scrambling to make changes.

The South Korean companies' metaplant in Georgia was the target of a vast federal immigration raid on September 4, during which 475 people were detained.

Last week’s immigration operation at a battery plant highlighted a tactic that companies use to bring in foreign workers to establish new operations.