A 2008 law to address human trafficking is at the center of the debate over the immigration crisis at the nation's Southern border.
The law was passed at a time when fewer than 10,000 unaccompanied minors showed up each year at the border. This year there are expected to be 90,000.
They are flooding the system partly because the law requires special legal protections for people arriving here from Central America.
Republicans want to change the law to allow Central American migrants to be treated the same as unaccompanied youths arriving from Mexico, who can be turned around at the border without a legal hearing.
Immigration advocates and Democrats are increasingly opposed because they say many migrants are fleeing horrific gang violence and should not be sent back.