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Former U.S. Special Envoy for Ukraine Kurt Volker is still planning to appear at his deposition Thursday in front of three congressional committees, according to two sources familiar with Volker's latest thinking.

Read alsoUkraine's ex-FM Klimkin: Kurt Volker is first not political but real loss

Volker's plan to follow through with his deposition comes after Secretary of State Mike Pompeo accused House Democrats of intimidating and bullying State Department officials by calling for their depositions in the Ukraine inquiry starting this week, something he says is "not feasible," CNN wrote.

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It remains unclear whether the four current State Department officials will be deposed in the coming days by House committees, according to congressional sources.

CNN reported Saturday that Volker had planned to appear for the deposition.

In a letter to trustees of the McCain Institute on Saturday, Volker wrote that Congress requested his testimony and that he would "be complying with that request."

His appearance before the Intelligence, Oversight and Reform and Foreign Affairs committees was announced just hours before the news broke Friday evening that he had resigned.