The agency said it has a limited authority to detain families seeking asylum. The current cap is 20 days to hold children in custody.
San Diego County supervisors are reportedly planning to sue the Trump administration over the widespread releases of asylum-seeking families.
The county board voted on the decision during a closed-door meeting on Tuesday, two supervisors confirmed. It was not immediately clear on what grounds the lawsuit would be argued or when it would be filed.
Since late October, the U.S. has been releasing asylum-seeking families so quickly that they don't even have time to make travel arrangements, merely giving them notices to appear in immigration court.
The families often end up in shelters run by charities and wear thin border town's resources.