Lt. Col. Alexander Vindman sent an emotional message to his father toward the end of his opening statement in Tuesday's impeachment hearings.
Vindman applauded his father for deciding to flee the Soviet Union and bring the family to the US in the 1970s.
"Dad, I'm sitting here today in the US Capitol talking to our elected professionals is proof that you made the right decision 40 years ago to leave the Soviet Union," he said.
Vindman added: "Do not worry. I will be fine for telling the truth."
Follow along with our live coverage of the hearings here.
Visit Business Insider's homepage for more stories.
Lt. Col. Alexander Vindman concluded his opening statement in the third day of public hearings in the impeachment inquiry with an emotional message to his father celebrating the rights and freedoms enjoyed by US citizens.
Vindman came to the US as a child from Ukraine when it was still part of the Soviet Union. In his testimony on Tuesday, the Army lieutenant colonel and National Security Council official applauded his father for deciding to flee Ukraine in the late 1970s and settle the family in the US.
"Dad, I'm sitting here today in the US Capitol talking to our elected professionals is proof that you made the right decision 40 years ago to leave the Soviet Union and come here to the United States of America in search of a better life for our family," Vindman said. "Do not worry. I will be fine for telling the truth."
Vindman speaks to his father: "You made the right decision 40 years ago to leave the Soviet Union and come here to the [USA] in search of a better life for our family."
"Do not worry. I will be fine for for telling the truth." pic.twitter.com/k0ie3DePwj
- Brandon Wall (@Walldo) November 19, 2019
At another point, Vindman reflected on the fact that he would not be able to speak so freely in many countries.
"My simple act of appearing here today, just like the courage of my colleagues who have also truthfully testified before this committee, would not be tolerated in many places around the world," Vindman said, adding that in Russia, "offering public testimony involving the president would surely cost me my life."
Vindman, the top expert on Ukraine on the NSC, was on the July 25 call between US President Donald Trump and Ukrainian President Volodymyr Zelensky that sparked a whistleblower complaint and spiraled into the impeachment inquiry. In the call, Trump urged Zelensky to launch investigations into former Vice President Joe Biden and his son Hunter and into a debunked conspiracy theory about the 2016 US presidential election.
During Tuesday's hearing, Vindman described the July 25 call as "inappropriate" and said what he heard "had significant national security implications for our country."
"It is improper for the president of the United States to demand a foreign government investigate a US citizen and a political opponent," Vindman said.
Vindman, a decorated Iraq War veteran, has been attacked by the president and his allies for participating in the impeachment inquiry. Trump has sought to publicly malign multiple witnesses in the inquiry, something Vindman alluded to in scathing terms on Tuesday.
"The character attacks on these distinguished and honorable public servants is reprehensible," Vindman said.
Read more of Insider's impeachment coverage:
Here's who's scheduled to testify in this week's impeachment inquiry hearings
Think Trump will get impeached? Gambling sites say the odds are in your favor
Trump could be impeached and removed from office but still win reelection in 2020
Over half of the House of Representatives support the impeachment inquiry against Trump - see all of them here
Everything you need to know about Trump's impeachment process: What's happened, who the players are, and what comes next
NOW WATCH: Extremists turned a frog meme into a hate symbol, but Hong Kong protesters revived it as an emblem of hope