Kurt Volker Kurt VolkerGOP senators request details on Hunter Biden's travel for probe Yovanovitch retires from State Department: reports Live coverage: Senators enter second day of questions in impeachment trial MORE, the former special envoy to Ukraine, testified publicly before the House Intelligence Committee on Tuesday as part of the impeachment inquiry into President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE.

Volker is considered a key witness in the inquiry. He resigned from his position a day after the release of a whistleblower report that said Trump pressed Ukrainian President Volodymyr Zelensky to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and his son Hunter Biden and that White House officials sought to cover it up.

Volker said in his opening statement that he "at no time ... knowingly took part in an effort to urge Ukraine to investigate former Vice President Biden."

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Read his full opening statement below:

Final Volker Testimony 11-1... by M Mali on Scribd