Paolo Zampolli, a former modeling agent turned presidential special envoy, had learned that his Brazilian ex-girlfriend was in a Miami jail, arrested on charges of fraud at her workplace. They had been in a custody battle over their teenage son. Now he saw an opportunity.

He reached out to a top official at Immigration and Customs Enforcement, explaining that his ex was in the country illegally, according to records obtained by The New York Times and a person familiar with the communications. Could she be put in ICE detention? That could help him get his son back.

The official, David Venturella, promptly called the agency’s Miami office to ensure that ICE agents would pick up the woman from the jail before she was released on bail, according to the records and a person with knowledge of the conversation who requested anonymity to discuss it. During the call, Mr. Venturella noted that the case was important to someone close to the White House.

The woman, Amanda Ungaro, was placed in ICE custody and ultimately deported, an outcome that may well have happened regardless of Mr. Zampolli’s meddling. But the ICE official’s willingness to spring into action for a Trump ally — even one in a low-level, largely ceremonial role — reflects a recurring theme of the second Trump administration: The levers of the federal government can be pulled to settle a personal score.