As Vindman has risen to become an important figure in the impeachment proceedings, the Army has undertaken security assessments about his family's physical security. For now, the Army is monitoring his home with \"routine physical surveillance from law enforcement,\" the official told ABC News.

Should additional security concerns need to be addressed, the U.S. official speculated that moving the Vindman family to a military base in the Washington area could become an option.

During Tuesday's hearing, Vindman acknowledged that he has been disparaged on social media because of the testimony he has provided the congressional committees leading Trump's impeachment hearings. In his opening remarks, he said he wanted to recognize the courage of his colleagues who have and were scheduled to testify.

\"I want to state that the character of attacks on these distinguished and honorable public servants is reprehensible,\" he told lawmakers. \"It is natural to disagree and engage in spirited debate. This has been the custom of our country since the time of our founding fathers, but we are better than personal attacks.\"

\"PHOTO:
Drew Angerer/Getty Images
PHOTO: National Security Council Director for European Affairs Lt. Col. Alexander Vindman arrives to testify before the House Intelligence Committee in the Longworth House Office Building on Capitol Hill Nov. 19, 2019 in Washington, D.C.
>

\"I also recognize that 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,\" he added.

He finished his opening statement addressing his father, who immigrated to the United States.

\"Dad, I'm sitting here today in the U.S. Capitol, talking to our elected professionals, 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,\" he said. \"Do not worry. I will be fine for telling the truth.\"

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