CHICAGO - U.S. Border Patrol Chief Greg Bovino will appear in federal court in Chicago on Tuesday to answer questions about his use of tear gas in Chicago neighborhoods in apparent violation of a court order.

What we know:

Bovino was ordered to testify before U.S. District Judge Sara L. Ellis after video surfaced showing him appearing to throw a tear gas canister into a crowd of demonstrators in Little Village last week. The court order in question prohibits federal agents from using force or chemical agents unless a law is being broken.

Tear gas was reportedly used again on Saturday in Old Irving Park after agents were seen tackling a man in a yard, prompting nearby residents headed to a neighborhood Halloween parade to join spontaneous protests. Witnesses said the gas was deploy

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