Remember Alexander Vindman? Testified in Trump's first impeachment hearing, then he and his twin brother were evicted from jobs in the White House and Trump tried to bring him up on charges? He as written a book.

What I Heard in the White House Basement
I knew the president had clear and straightforward talking points—I’d written them.

By Alexander Vindman

This article basically recounts the events of the Trump conversation with the newly-elected president of Ukraine, and how he and others responded to the shift in policy that was intended to get Trump re-elected. It covers the events discussed in the impeachment hearing.

In my life, that quiet inner voice has been a real person: my brother. Our unique relationship was about to matter more than it ever had before. The walk that morning from the White House basement up to my brother’s office is pretty much a blur but I do remember looking around the conference room when the meeting broke up, knowing that others, including my boss, had heard what I’d heard. In that moment, I realized something right away. Nobody else was going to say anything about it. I was the person most knowledgeable about and officially responsible for the portfolio. If I didn’t report up the chain of command what I knew, no one might ever find out what the president was up to with Ukraine and the 2020 U.S. election. That’s why I went straight to Yevgeny’s office.