May 9 (UPI) -- Federal prosecutors issued subpoenas to associates of Michael Flynn as part of the FBI's investigation into Russia's alleged meddling in the U.S. election, sources familiar with the case said.
Federal prosecutors were seeking business records from associates who worked with Flynn on contracts after his dismissal as director of the Defense Intelligence Agency in 2014, the sources told CNN. The New York Times confirmed the details.
Flynn, who resigned in February as President Donald Trump's former national security adviser, is under investigation for his financial connection to Russia and Turkey. He is also facing a Pentagon probe into foreign payments he received in 2015.
Comey confirmed in March his agency has been investigating whether the Russian government attempted to influence the outcome of the 2016 presidential election.
The subpoenas indicate a broadening of the FBI's investigation started last July into possible ties between Trump campaign associates and Russia.
Subpoenas are routine in federal investigations and do not indicate charges are imminent.
Robert Kelner, an attorney for Flynn, the U.S. Attorney's Office in Alexandria, the Justice Department and the FBI all declined comment to CNN.
In March, the Senate rejected Flynn's offer to testify in exchange for immunity from criminal prosecution.