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Trump also expressed his frustration with Schiff calling him a \"stone-cold liar.\"

\"I can say Schiff has proven to be a liar,\" Trump said. \"We've known it for three years because they've been trying to impeach for three years. He's a liar. He's a stone-cold liar.\"

-- ABC News' Ben Gittleson

9:06 a.m. Kurt Volker arrives for deposition

Kurt Volker, who resigned last week as the special envoy to Ukraine, is set to testify behind closed doors Thursday morning to the House Intelligence, Oversight and Foreign Affairs Committees.

\"PHOTO:
J. Scott Applewhite/AP
PHOTO: Kurt Volker, a former special envoy to Ukraine, arrives for a closed-door interview with House investigators, as House Democrats proceed with the impeachment inquiry of President Donald Trump, at the Capitol in Washington, Oct. 3, 2019.
>

His deposition is set to focus on the explosive whistleblower complaint claiming that President Donald Trump ordered state officials to work with Ukraine to target political rivals.

Volker is now involved impeachment inquiry controversy due to his apparent efforts in facilitating a meeting between Trump and Ukraine's president. His Thursday testimony is the latest update in the overall controversy.

Volker arrived as the first witness to testify on Capitol Hill despite Secretary of State Mike Pompeo’s refusal to allow State Department to testify.

-- ABC News' Allison Pecorin

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