The Senate Judiciary Committee has issued a subpoena for Paul Manafort, who served as chairman of Donald Trump’s 2016 presidential campaign, to appear at a hearing on Wednesday as part of the ongoing probe into alleged Russia meddling in the 2016 presidential election.

"While we were willing to accommodate Mr. Manafort's request to cooperate with the committee's investigation without appearing at Wednesday's hearing, we were unable to reach an agreement for a voluntary transcribed interview with the Judiciary Committee," Senate Judiciary Committee Chairman Chuck Grassley and ranking member Dianne Feinstein said in a statement. "Yesterday evening, a subpoena was issued to compel Mr. Manafort's participation in Wednesday's hearing."