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 On October 1, Secretary Pompeo responded to the Committees, refusing to make Ambassador Volker available on the requested date.$390$ On October 2, the Department of State wrote a letter to Ambassador Volker's counsel instructing Ambassador Volker not to reveal classified or privileged information and prohibiting Ambassador Volker from producing any government documents.$391$

On October 2, Ambassador Volker produced copies of text messages in response to the Committees' request.$392$ On October 3, Ambassador Volker voluntarily participated in a transcribed interview.$393$ In addition, on November 19, Ambassador Volker testified voluntarily at a public hearing.$394$

'Jennifer Williams, Special Advisor for Europe and Russia, Office of the Vice President'

On November 4, 2019, the Committees sent a letter to Jennifer Williams seeking her testimony at a deposition on November 7.$395$ On November 7, the Committees sent Ms. Williams a subpoena seeking her testimony the same day.$396$ Ms. Williams complied.$397$ On November 11, Ms. Williams sent a letter to Chairman Schiff to make one amendment to her deposition testimony.$398$ In addition, on November 19, the Committees conveyed a subpoena seeking Ms. William's testimony at a public hearing on November 19.$399$ Ms. Williams also complied with this subpoena and testified at the public hearing.$400$