CNN: Former FBI Lawyer Under Investigation For Altering Document

The transcript discusses the alteration of a document related to the surveillance of a 2016 Trump campaign aide. The alteration was discovered during an investigation by Justice Department Inspector General Michael Horowitz. Although the changes were significant, they did not affect the validity of the surveillance application. Horowitz provided evidence to federal prosecutor John Durham, who is investigating intelligence collected on the Russia probe. The document alteration may lead to accusations from Trump and his supporters against the FBI. Horowitz is set to release his report and testify before the Senate Judiciary Committee.

What role does John Durham play in the investigation related to the document?

What is the significance of Horowitz's report expected to be released on December 9th?