President Donald Trump speaks to members of the media on the South Lawn of the White House in Washington, Thursday, Oct. 10,…
President Donald Trump speaks to members of the media on the South Lawn of the White House in Washington, Oct. 10, 2019, before boarding Marine One.

VOA correspondent Henry Ridgwell contributed to this report from Kyiv.

WHITE HOUSE - The former U.S. ambassador to Ukraine is scheduled to testify before House committees leading the impeachment inquiry into President Donald Trump, however, it is still uncertain that the committees will be able to go ahead with their Friday meeting with Marie Yovanovitch.

The White House is refusing to participate in the impeachment inquiry, calling it “unconstitutional,” and the State Department has, thus far, blocked U.S. Ambassador to the European Union and Trump donor Gordon Sondland from giving voluntary testimony.

Ukrainian President Volodymyr Zelenskiy speaks during talks with journalists in Kyiv, Ukraine, Oct. 10, 2019. The Ukrainian leader is holding an all-day “media marathon” in a Kyiv food court amid growing questions about his actions as president.

Trump continues to maintain that his July 25th phone call with Ukraine’s president, Volodymyr Zelenskiy, which prompted the impeachment inquiry, was innocuous.

Zelenskiy has also stated that there was “no blackmail” in the call in which Trump asked Zelenskiy to investigate Democratic presidential frontrunner and former Vice President Joe Biden, and his son, Hunter.

There is no evidence of any wrongdoing by Joe or Hunter Biden.

After President Zelenskiy earlier in the day stated there was “no blackmail” in the July 25 call with Trump, the U.S. leader told reporters, “We released a perfect conversation. The president of Ukraine just confirmed that and that should be case over.”

Trump alleges that when Biden was vice president, he threatened to withhold loan guarantees to Ukraine unless the government stopped investigating a gas company on which Hunter Biden held a board seat.

House committees on Thursday issued a subpoena for Trump’s energy secretary, Rick Perry, as well as two associates of the president’s outside lawyer, former New York City Mayor Rudy Giuliani.

“I don’t know why they would be calling Rick Perry. I don’t know why they would be calling all these people. It is a very bad situation for our country,” Trump said to reporters on the White House South Lawn before boarding the Marine One helicopter.

House Democrats say Perry may have “reinforced the stark message” Trump conveyed to Zelenskiy. Perry says his only interest was to get Trump to talk to the Ukrainians on energy matters.

According to a whistleblower complaint, and a rough transcript of the call released by the White House, Trump urged Zelenskiy to open an investigation into Biden.

FILE - Kurt Volker, a former special envoy to Ukraine, leaves after a closed-door interview with House investigators as House Democrats proceed with the impeachment investigation of President Donald Trump, at the Capitol in Washington, Oct. 3, 2019.

The three main House committees conducting the impeachment inquiry have released a set of text messages obtained from former U.S. envoy to Ukraine Kurt Volker, including one Volker sent to Zelenskiy aide Andrey Yermak saying, “We will nail down date for visit to Washington” if Zelenskiy “convinces Trump he will investigate.”

Zelenskiy was elected in April on a platform of rooting out corruption. Now the Ukrainian leader is facing criticism over his own conduct, according to political analyst Ilya Kusa of the Ukrainian Institute of the Future.

“It has become his first international diplomatic crisis. He allowed us to get involved in the American elections and this is not the thing that we should have done because we have plenty of our own problems and trying to get into this process, it’s too global, too big a game to play. And, of course, too risky because Ukraine here is just a gambling chip,” Kusa says.

Volker last week gave closed-door testimony to the House Intelligence, Foreign Affairs and Oversight committees.

Special Section

VOA Explains

Image of US Capitol and White House on red background
Why has Congress opened up an impeachment inquiry involving President Donald Trump?
Default Author Profile
By VOANews
Thu, 10/10/2019 - 14:03
A Senate Gallery pass from the impeachment trial of President Andrew Johnson in 1868
A two-step process in the House and Senate required to remove the president from office
FILE PHOTO: A section of the report from the U.S. intelligence community whistleblower to the U.S. House Intelligence Committee…
Government system designed to protect employees who expose wrongdoing
Default Author Profile
Mon, 10/07/2019 - 16:40
Texts between Gordon Sondland and William Taylor are superimposed over a hand holding a mobile phone
Former Special Envoy to Ukraine Kurt Volker released dozens of text messages between top State Department officials handling European and Ukrainian affairs.
Explainer: The Impeachment process
00:01:26
If a civil officer of government - including the president - is suspected of wrongdoing, he or she may be removed from office if the House of Representatives votes to impeach and they are convicted in a Senate trial.