President Trump on Tuesday questioned why people he has “never even heard of” are appearing before House committees involved in the impeachment probe and suggested that proof of his innocence is in the transcript of the Ukrainian call released by the White House.

“Why are people that I never even heard of testifying about the call. Just READ THE CALL TRANSCRIPT AND THE IMPEACHMENT HOAX IS OVER! Ukrain [sic] said NO PRESSURE,” the president tweeted Tuesday morning.

Trump has described his July conversation with Ukrainian President Volodymyr Zelensky as “perfect” and denies there was any quid pro quo to coerce Zelensky into beginning an investigation into Democratic presidential candidate Joe Biden and his son Hunter.

House Speaker Nancy Pelosi launched the impeachment inquiry last month after a whistleblower’s complaint revealed the phone call.

The White House then released a rough transcript of the conversation.

Trump’s defense comes as an Army officer who listened in on the call is poised to testify Tuesday on Capitol Hill that he was so disturbed by the conversation that he reported it to higher-ups.

“I was concerned by the call. I did not think it was proper to demand that a foreign government investigate a US citizen, and I was worried about the implications for the US government’s support of Ukraine,” Lt. Col. Alexander Vindman will tell lawmakers during the closed-door hearing, according to his opening statement.

“I realized that if Ukraine pursued an investigation into the Bidens and Burisma it would likely be interpreted as a partisan play which would undoubtedly result in Ukraine losing the bipartisan support it has thus far maintained,” it continued.

Vindman, who was awarded the Purple Heart after being wounded in Iraq, reported it to the lead counsel for the National Security Council.

An immigrant who fled the Soviet Union with his family when he was just over 3 years old, Vindman said he was motivated to come forward because he has a “deep appreciation for American values and ideals and the power of freedom.”

“I am a patriot, and it is my sacred duty and honor to advance and defend OUR country, irrespective of party or politics,” he said in the opening statement.