Paul Manafort's plea deal includes a cooperation agreement with Robert Mueller: attorney
Former FBI Director Robert Mueller said cyber security will be the number one future threat in the country, but for the time being, "counterterrorism and stopping terrorist attacks" is more important. (Photo: Kit Fox/Medill Flickr)

Former Trump campaign chairman Paul Manafort has entered into a plea deal with special counsel Robert Mueller's office -- and it includes an agreement to cooperate.

As reported by CNN's Evan Perez, prosecutor Andrew Weissmann told the court on Friday that Manafort's plea deal hinges on him completing a cooperation agreement with the special counsel.

While it had been widely reported that Manafort would enter a guilty plea to various charges on Friday to avoid having to go through a second trial, it was not known whether Manafort would act as a cooperating witness in Mueller's probe.