Paul Manafort br Pleads Guilty, Will Cooperate br With Special Counsel Mueller President Donald br Trump's former br campaign chairman Manafort will also br cooperate with Mueller br and his team of prosecutors. Manafort cooperation agreement, via NBC News Mueller's team is br investigating br possible collusion The first trial br against Manafort br was a victory Jury selection for br Manafort's second br trial was to begin Monday. Now that Manafort has plead guilty, a charging document will replace what may have been an indictment. The charges against Manafort include conspiracy involving money laundering, Statement, Robert Mueller's office, br via CNBC It's considered a significant blow br to President Trump that Manafort has decidedbr to become a witness for Mueller's investigation.