Former Trump administration national security adviser John Bolton has agreed to plead guilty to a single count of retaining classified information under a plea deal with the Justice Department, according to multiple sources familiar with the matter.

The agreement would resolve a criminal case filed in October that originally charged Bolton with 18 counts of either retaining or disseminating classified information. Under the plea deal, Bolton would face a $2.25 million fine and could receive a prison sentence of up to five years, though the agreement allows for the possibility of no prison time. The final sentence will be determined by a judge.

The charges stem from diary-like notes from Bolton's time in government that officials say he shared with family members while preparing a memoir about his tenure. The plea deal covers these notes shared with relatives, separate from information contained in his controversial book "The Room Where It Happened," which the Trump administration unsuccessfully sought to block from publication on national security grounds.

Bolton served as national security adviser for more than a year during Trump's first administration before being fired in 2019. He subsequently became a vocal critic of the former president and published his memoir detailing his time in the White House.

The FBI investigation into Bolton became public in August when agents served warrants at his Maryland home and office. Bolton is among multiple Trump administration critics who have faced prosecution over the past year.

A rearraignment hearing, which typically signals a plea agreement, is scheduled for June 26 in federal court in Greenbelt, Maryland. The Justice Department declined to comment on the matter.