The incident involving Border Patrol Commander Greg Bovino, has been a key part of the court proceedings challenging immigration tactics in Chicago.

A Customs and Border Patrol agent appeared to brag to fellow agents about his marksmanship when he shot a woman five times after their cars collidedin Chicago last month, text massages shown in court revealed.

Patrol Chief Jon Hein faced a flood of criticism — from ex-cops, internet trolls and members of his own department — after his officers were ordered not to respond to the Oct. 4 shooting in Brighton Park.

A Chicago mother tells NBC News she and her 2-year-old were hit with a chemical agent. Many residents say the city wasn’t a “war zone”— until immigration agents swept through.

Wednesday's hearing is expected to see more testimony — including from a five-hour deposition of Border Patrol chief Greg Bovino — about federal immigration agents' actions in Chicago.