A press release from Richard Burr and Mark Warner, the top Republican and Democrat on the Senate Intelligence Committee:
The Senate Select Committee on Intelligence today issued a subpoena for former National Security Advisor Lieutenant General Michael Flynn. The subpoena requests documents relevant to the Committee's investigation into Russian interference with the 2016 election. The Committee first requested these documents in an April 28, 2017 letter to Lieutenant General Flynn, but he declined, through counsel, to cooperate with the Committee's request.
Why it matters: Amid the turmoil at the FBI, Senate Intel is sending a clear signal that its Russia probe is moving forward. CNN reported last night that the FBI had issued subpoenas seeking business records from associates of Flynn's, so the ousted National Security Adviser appears to be at the center of both investigations, though he did not comply with the committee's earlier request.