agent

Mr Smith and his former colleague Clyde Foreman, a former supervisory special agent, recall urging their colleagues to make the arrest once he had been identified as the main suspect.

The post coincided with the deployment of 300 federal agents to Chicago, using the nearby Great Lakes Naval Station as a logistical hub for expanded immigration enforcement operations.

They want the judge to require new training and forbid agents involved in a July raid in Sacramento from participating in other operations until they are retrained.

Immigration and Customs Enforcement agents, many of them masked, are running traffic checkpoints and bashing in car windows with batons in their search for migrants.

The Department of Homeland Security told the BBC's US partner CBS News that agents executed a search warrant due to allegations of "unlawful employment practices and other serious federal crimes".