US Border Patrol chief Gregory Bovino leads his troops as they confront demonstrators outside an immigrant processing center on September 27 in Broadview, Illinois. Scott Olson/Getty Images

US Customs and Border Patrol Chief Gregory Bovino will appear in court Tuesday to answer a judge’s concerns about federal agents’ aggressive tactics after he was recorded throwing what appears to be a tear gas canister into a crowd.

District Judge Sara Ellis issued a temporary restraining order this month blocking agents from using certain types of force against protesters. In recent weeks she’s said she has concerns about whether her order was being followed.

Here’s what we know about the incidents in question.

Multiple violations of the order

A court filing against the Department of Homeland Se

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