To the Editor:

Re “Colonel Tried to Fill Gaps in Ukraine Call Transcript” (front page, Oct. 30):

I read Lt. Col. Alexander Vindman’s opening statement before the House Committees on Intelligence, Foreign Affairs and Oversight . Can there be a more overwhelmingly compelling statement of what happened between Ukrainian and American officials?

Colonel Vindman came to this country at age 3 from Ukraine. He wanted nothing more than to serve the United States, and he has in myriad ways. He states that he is — and certainly sounds — utterly nonpartisan.

During a July 10 meeting with Oleksandr Danylyuk , a senior government official from Ukraine, Gordon Sondland, ambassador to the European Union, talked about the need to deliver “ specific investigations ” in order to secure a meeting with President Trump.

After that meeting, according to Colonel Vindman’s testimony, “ I stated to Amb. Sondland that his statements were inappropriate, that the request to investigate Biden and his son had nothing to do with national security, and that such investigations were not something the N.S.C. was going to get involved in or push.”