(CNN) Secretary of State Mike Pompeo on Friday failed to meet a subpoena deadline from the House to produce Ukraine-related documents.

A House Foreign Affairs Committee aide told CNN that "Secretary Pompeo has failed to meet the deadline to produce documents required by the subpoena. However, the State Department has contacted the Committees on this matter and we hope the Department will cooperate in full promptly. Apart from the outstanding subpoena, we look forward to hearing from Ambassadors Sondland and Yovanovitch next week."

CNN has reached out to the State Department for comment.

On Saturday, Pompeo told reporters that the US State Department had sent a letter to Congress Friday night with its "initial response" to the document request.

"We'll obviously do all the things we are required to do by law," Pompeo said, during a press conference in Athens, without elaborating on what the department's response said.

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