This information came out via a joint statement from chair Richard Burr and ranking member Mark Warner. Flynn had offered to testify before the Senate and House intelligence committees in exchange for immunity but neither committee appears to have accepted the offer.

The AP reports:

The Senate intelligence committee has subpoenaed former Trump national security adviser Michael Flynn for documents related to the panel’s investigation into Russia’s election meddling.

Sen. Richard Burr, the Republican chairman, and Sen. Mark Warner, the committee’s Democratic vice chairman, say the panel had first requested the documents from Flynn on April 28. They say Flynn’s lawyer declined to cooperate with the request.

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Flynn was fired by Trump after less than a month on the job. The White House said he misled Vice President Mike Pence and other top officials about his communications with Russia’s ambassador to the United States.

Flynn’s Russia ties are also being scrutinized by the FBI as it investigates whether Trump’s campaign was involved in Russia’s election interference.