CNN- The special counsel investigation into Russian interference in the 2016 election revealed Tuesday night that prosecutors say they have connected former Trump deputy campaign chairman Rick Gates to a person with ties to a Russian intelligence service while Gates worked on the campaign. That Gates and the unnamed person, who had lived in Kiev and Moscow and worked for one of Paul Manafort's companies, were in touch in September and October 2016 was "pertinent to the investigation," a court filing from prosecutors said Tuesday night. The acknowledgment that Gates knew the person had Russian intelligence ties is alleged in a report prosecutors filed about the coming sentencing of a Dutch attorney. That attorney, Alex van der Zwaan, who worked with Gates and Manafort previously, pleaded guilty last month to lying to special counsel Robert Mueller's investigators about his interactions with Gates and the unnamed person.