Rick Gates, former deputy campaign manager for Donald Trump, exits Federal Court in Washington, D.C., U.S., on Friday, Feb. 23, 2018.
Gates is a former business partner of Paul Manafort, who served for several months as chief of Trump's 2016 presidential campaign.
Gates served on that campaign as well, and on Trump's inaugural committee.
Gates later testified at the trials of Manafort, Trump's long-time friend Roger Stone and Washington lawyer Greg Craig, who had served under two Democratic presidents.
Prosecutors in their filing Tuesday wrote, "Since entering a guilty plea in February 2018, the defendant, Richard W. Gates III, has provided the government with extraordinary assistance," prosecutors wrote.