CHICAGO (WLS) -- A judge on Monday ordered the government to preserve all video evidence that shows federal immigration enforcement agents deploying tear gas and other chemical agents toward Chicago-area protesters, members of the media and others since the beginning of the Department of Homeland Security's immigration operation "Midway Blitz."

But on the stand Monday, the second-in-command of Chicago's Immigration and Customs Enforcement field office said that any footage recorded before Sept. 18 has likely already been erased.

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District Court Judge Sara Ellis order came as representatives from both ICE and Customs and Border Patrol testified before her at the Dirksen Federal Courthouse on Monday about recent protests and the use

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