The Trump administration is reviewing its vetting process for Immigration and Customs Enforcement officers following allegations that an agent linked to the fatal shooting of a Colombian immigrant in Maine had a history of violent behavior, White House border czar Tom Homan said Sunday.

Speaking on CNN's "State of the Union," Homan said the Department of Homeland Security is investigating whether warning signs about the officer were overlooked during the hiring process.

He said any substantiated history of violence should have disqualified the individual from serving as a federal immigration officer.

"If this person had that type of history, it would have been a vetting issue, and it should have been brought to the attention of those who make those decisions," Homan said.

The comments came after The Washington Post reported that Ashley Brouillette identified her former husband, David Brouillette, as the ICE officer involved in the July 13 fatal shooting of Colombian immigrant Johan Sebastián Duran Guerrero in Biddeford, Maine.

The Department of Homeland Security has not publicly identified the officer involved.

Ashley Brouillette told the newspaper her ex-husband had a pattern of violent outbursts during their marriage, including an incident in which she alleged he threw boiling water on her while she was holding their young daughter. The report also said his two former wives accused him of abuse and that he was once ordered to surrender his firearms.

Homan did not confirm that David Brouillette was the officer involved but said DHS is conducting both a criminal investigation into the shooting and an administrative review of the hiring process.

"When they hire somebody, they put them through a vetting process and look at all that stuff," he said. "Was that information not available? Did they not know? So there's a separate administrative investigation on what happened here."

Duran, 25, was fatally shot during an encounter with ICE officers in Biddeford. His death sparked protests across Maine, with demonstrators calling for greater transparency and accountability from federal immigration authorities.

Despite the investigation, Homan defended ICE's overall hiring practices, noting the agency employs roughly 30,000 people.

"This is kind of a rare instance, but again, it's under review," he said.