An FBI official is under criminal investigation related to surveillance of a Trump campaign adviser in 2016.

The official is accused of altering a document related to that surveillance.

The document is reportedly related to the FBI’s efforts to get FISA warrants on former Trump aide Carter Page.

The changes were apparently drastic enough to shift the document’s meaning.

Department of Justice Inspector General Michael Horowitz is expected to release his report on the matter and testify in front of the Judiciary Committee next month.