A one-page memo filed in court suggests that federal investigators had an informant inside Paul Manafort's consulting firm.<br />Manafort served as President Donald Trump's campaign chairman for a short time, and has become involved in Special Counsel Robert Mueller's investigation into Russian ties with the campaign.<br />The memo, filed by Manafort's attorneys, indicates that someone at the firm allowed a journalist to review digital records, including financial records. <br />
