The FBI under Robert Mueller undermined public confidence in justice while James Comey nearly destroyed it completely, a new book claims.

Ex-FBI agent Mike German, a 16 year veteran of law enforcement, writes the former directors of the bureau turned it into a 'lawless law enforcer'.

In Disrupt, Discredit, and Divide: How the New FBI Damages Democracy, German says: 'The FBI has systemic problems that, left unchecked, make the bureau a threat to the very democracy it is intended to serve'. 

In a damning history of the FBI, German claims that Mueller, who later became the Special Counsel in the investigation into Russian interference in the 2016 election, wanted to 'remake the FBI in his own image' with no room for dissent.