A longtime FBI deputy director who had been expected to replace Director Christopher Wray on an acting basis is retiring from the bureau.

The FBI’s acting director told senior leadership he was retiring Monday, as the bureau braces for a major shakeup under the Trump administration. Paul Abbate had earlier been expected to serve in the role for a few months after Christopher Wray’s departure.

A veteran of the bureau, Mr. Abbate has served as deputy director since early 2021 and took the helm from Christopher A. Wray as the agency faces an uncertain future.

Paul Abbate, the deputy director of the FBI who took over temporarily as acting director after the resignation of Christopher Wray, retired from his post on Monday, an FBI official said.