Editor's Note: This article originally appeared on Business Insider.

The Army is prepared to move Lt. Col. Alexander Vindman and his family to a secure location on a military base if it's deemed necessary, according to U.S. officials who spoke to The Wall Street Journal.

Vindman has been the target of repeated public attacks, including from President Donald Trump, over his central role in the escalating impeachment inquiry into Trump.

If it's determined that Vindman or his family are in physical danger, then they will be moved to a safe location, the Journal reported.

Army spokeswoman Col. Kathy Turner said in a statement to Insider that the Army “is providing supportive assistance to help Lt. Col. Vindman with the public attention.”

“As a matter of practice, the Army would neither confirm nor deny any safety or security measures taken on behalf of an individual; however, as we would with any Soldier, the Army will work with civilian authorities to ensure that he and his family are properly protected,” Turner added.

Vndman, the top Ukraine expert on the National Security Council, is a key figure in the impeachment inquiry. The active duty Army officer and Iraq War combat veteran was on a July 25 phone call between Trump and Ukrainian President Volodymyr Zelensky that is at the center of the investigation.

During the call, Trump urged Zelensky to launch investigations into former Vice President Joe Biden and his son, Hunter Biden, as well as a debunked conspiracy theory linked to the 2016 election.

“I was concerned by the call. What I heard was inappropriate…It was improper for the president to demand an investigation into a political opponent,” Vindman said during his public testimony on Tuesday.

Republican lawmakers on the panel in Tuesday's impeachment hearings sought to discredit Vindman in multiple ways, including by
zeroing in on the fact he wore his military uniform. The president's GOP allies also sought to smear Vindman by implying that he has dual loyalty to Ukraine. Vindman came to the U.S. from Ukraine as a refugee when he was a child and the country was still part of the former Soviet Union.

During Tuesday's hearings, some Democrats on the panel touched on safety concerns in their questioning of Vindman, particularly given the attacks he's faced.

At the beginning of his testimony, Vindman sent an emotional message to his father, applauding his choice to bring the family to the U.S. decades ago. He told his father not to worry, adding,
“I will be fine for telling the truth.”

When asked why he told his father not to worry, Vindman said: “This is America. This is the country I served and defended, that all my brothers have served — and here — right matters.”

The former refugee received
a standing ovation for these remarks.

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