Trump Impeachment Latest: What Ukraine Envoy Said About Allegations Against Joe Biden

President Trump’s former envoy to Ukraine Kurt Volker testified Tuesday he never was made aware of any investigation into former Vice President Joe Biden by Ukraine and finds the suggestion Biden is corrupt “not … at all credible.”

Volker was one of two witnesses appearing before House impeachment investigators Tuesday afternoon. The second was Tim Morrison, a National Security Council official, who said he sought to lock down access to a transcript of a call between Trump and Ukraine’s president because he found it politically volatile.

“My fears have been realized,” he said

In morning testimony, Lt. Gen. Alexander Vindman and Jennifer Williams, an aide to Vice President Mike Pence, testified they described a wholly inappropriate the phone call with Ukraine President Volodymyr Zelensky during which Trump asked for an investigation of Biden.

The testimony produced the trending hashtag #DevinNunesIsAnIdiot after the ranking Republican on the panel, Rep. Devin Nunes, was corrected by Vindman after Nunes referred to him as “Mr.” instead of “lieutenant colonel.”

Morrison said he and other security officials never would have recommended that Trump ask Ukraine to investigate his political rivals.

"At no time was I aware of or knowingly took part in an effort to urge Ukraine to investigate former Vice President Biden," Volker said, even though he was a member of an ad hoc group that was trying to set up a meeting between Trump and Zelensky.

Volker said he has “learned many things” about “the events in question” since he gave his closed-door testimony to the committee several weeks ago. He said he should have realized the push for an investigation into Ukrainian energy company Burisma really was an effort to start an investigation of Biden.

Volker said in his opening statement he rejected a conspiracy theory pushed by Trump attorney Rudy Giuliani that posited “Biden would have been influenced in his duties as vice president by money paid to his son.”

“It’s just not credible to me that a vice president of the United States is going to do anything other than act as how he sees best for the national interest,” Volker testified under questioning.

He also said it was not clear to him that the administration was holding military aid to Ukraine hostage to a Biden investigation.

He said Trump viewed Ukraine as corrupt and viewed Zelensky as just as bad as his predecessors. He said Trump brought up debunked rumors about Ukraine’s role in interference in the 2016 U.S. presidential election. Volker said he tried to disabuse the president of those beliefs but Trump told him to talk to Giuliani.

In the morning session, Vindman testified he gave Zelensky two pieces of advice: “To be particularly cautious with regard to Russia and its desire to provoke Ukraine, and to stay out of U.S. domestic” politics.

Vindman said he was " concerned” about the July 25 call, which he viewed as a demand rather than a request.

“What I heard was inappropriate. And I reported my concerns to Mr. [John] Eisenberg [the attorney for the National Security Council]. It is improper for the president of the U.S. to demand a foreign government investigate a U.S. citizen and a political opponent," Vindman testified.

Williams said she found the July 25 call “unusual” and gave a copy of the transcript to Pence but did not know whether he had reviewed it prior to a Sept. 1 meeting with Zelensky.

"In contrast to other presidential calls I had observed, it involved discussion of what appeared to be a domestic political matter,” she said, adding, “The reference to Biden sounded political to me.”

The White House blocked Williams from testifying about a subsequent call in September between Trump and Zelensky, but she said she would talk about it in either a classified session or in writing.

U.S. Ambassador to the European Union Gordon Sondland, a key figure in the effort to spark an investigation into Biden, was scheduled to testify Wednesday.