Former national security adviser Michael Flynn is refusing to comply with a request to appear before the Senate Intelligence Committee, CNN reported Tuesday.

Flynn first refused to comply with a subpoena to testify before the committee back in May.

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Flynn left the White House in February after reports emerged that he had failed to reveal conversations with Russian officials about removing sanctions against the country in the month before President Trump’s inauguration.

Robert Kelner, Flynn's lawyer, declined to comment to CNN for the story.

The former general has offered to testify before the House and Senate intelligence committees in exchange for immunity, but lawmakers have rejected the deal.

Both committees are conducting their own investigations into Russian interference in the election, including Trump and his campaign officials’ ties to Russia.