Rick Gates, the right-hand man of Trump’s former campaign chair Paul Manafort, testified in federal court Monday that he has been involved in criminal activity with Manafort. Gates has accepted a plea deal to testify against Manafort, who is facing 18 charges, including tax fraud, bank fraud and money laundering. Manafort’s trial is the first trial associated with special counsel Robert Mueller’s investigation into Trump’s ties to Russia. During Monday’s hearing, Gates testified he helped Manafort hide secret foreign bank accounts, obscured by 15 shell companies, which the prosecution alleges were part of a long-running tax and bank fraud scheme. In his testimony, Gates said, “I was the one who helped organize the paperwork.”