Who’s Gregory Bovino and why is he appearing in a Chicago courtroom on Tuesday?

U.S. Border Patrol Commander-at-large Gregory Bovino has been ordered to appear before a federal judge Tuesday morning at Chicago’s Dirksen Federal Courthouse. Here’s what we know about Bovino, the judge and what to expect from Tuesday’s hearing:

What time is the hearing?

The hearing is set to begin at 10 a.m. Tuesday in U.S. District Judge Sara Ellis’ courtroom at the Dirksen Federal Courthouse in Chicago’s Loop. Go to suntimes.com for coverage starting shortly before the hearing.

Who is Gregory Bovino?

Bovino has become the public face of the Trump administration’s aggressive deportation campaign in Chicago, known as “Operation Midway Blitz.” He often wears a green Border Patrol jacket and sports a high-and-tight spiky hairdo. His exploits are often captured in Hollywood-style videos that wind up on social media.

He’s worked for the Border Patrol since 1996 and was the chief patrol agent of the El Centro sector headquartered near the Mexico border in California.

The North Carolina native also led “Operation At Large” in California, which led to a controversial ruling by the U.S. Supreme Court last month. That ruling allowed federal agents out west to continue stopping people based on race, language and other factors.

Bovino has since told a WBEZ reporter that agents in Chicago were stopping people based partly on “how they look.”

Why is Bovino expected in court?

Judge Ellis, who is presiding over a lawsuit brought by media organizations over the treatment of protesters during the federal deportation campaign, on Friday ordered Bovino to appear in her courtroom. The order came one day after attorneys accused Bovino of tossing tear gas into a crowd in the Little Village neighborhood without justification. The attorneys say that violated an order Ellis handed down earlier this month.

That earlier order forbade federal agents from using gas and other “riot control” weapons without two warnings or against people who pose no immediate threat. Federal officials say warnings were given before Bovino and others deployed riot control measures in the incident in question.

However, the judge has not specifically said what prompted her to summon Bovino into her courtroom. Her two-sentence order simply set the time for the hearing and said the Trump administration should “produce Defendant Gregory Bovino, in person, for this hearing.”

The judge has also ordered Bovino to sit for up to five hours for an under-oath deposition with lawyers in the case.

Will Bovino show up?

Department of Homeland Security officials have not confirmed specifically that Bovino will appear in Ellis’ courtroom. Instead, they’ve said “DHS can think of nobody better to correct Judge Ellis’ deep misconceptions about its mission.”

Court officials say live testimony is expected, though they do not specify whether Bovino will testify. And other details about the hearing, including its estimated length, are unclear.

Ellis will have multiple options available to her if she is unhappy with Bovino, including a potential finding of contempt.

Who is Judge Sara Ellis?

Ellis is a native of Ontario, Canada, nominated to the bench by President Barack Obama in 2013. Before becoming a judge, she also worked as a staff attorney in the Federal Defender Program and as assistant corporation counsel in Chicago City Hall from 2004 to 2008.

Ellis has shown increasing frustration with the feds’ tactics during “Operation Midway Blitz.” Earlier this month she ordered lower-ranking officials into her courtroom to answer questions, telling lawyers in the case, “I’m not blind,” and citing media reports about the use of tear gas around Chicago.