Prince William County has such a large backlog of jail inmates who have been identified as illegal immigrants under the first phase of a new crackdown that the federal government cannot keep up, raising concerns about the government’s ability to handle the second phase coming in March.

“I’m hearing many, many cases of people are being picked up for very minor crimes and being put in detainers, and then having to wait,” said Lisa Johnson-Firth, a Manassas immigration lawyer.