WATCH: Paul Manafort surrenders to FBI

Paul Manafort, former Trump campaign manager, walked into a Washington D.C. FBI office this morning with his lawyer and was told to surrender to authorities.

A grand jury approved charges against Manafort and his former business partner Rick Gates early Monday morning.

President Trump, through a series of tweets Sunday, called the probe a "witch hunt" saying "there is so much guilt by Democrats/Clinton." Last week, it came to light that Democrats helped pay for some of the information in a dossier of allegations against the president's election team.

Some Republicans , like Governor Chris Christie are questioning how the indictment was leaked. Christie stated that there are strict laws against any of this type of leaking of grand jury activity.

About the Author