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Vindman rose from relative obscurity after he testified in the House about Trump's phone call with Ukrainian President Volodymyr Zelensky, which he called "improper." After Trump was acquitted, he relieved Vindman of his post in the National Security Council.
In July, Vindman retired from military service after an alleged "campaign of bullying, intimidation, and retaliation by President Trump and his allies."
According to The Federalist's Mollie Hemmingway and the Washington Examiner's Byron York's book, Obsession: Inside the Washington Establishment's Never-Ending War on Trump, which identifies Vindman as the driving force behind the impeachment proceedings, Vindman was the only person on the National Security Council to listen in on the Ukraine call and express concern about it.
During the impeachment trials, Vindman admitted to leaking information about the Ukraine phone call to two people, one of whom he said worked at the State Department and the other of whom he said worked within the U.S. intelligence community. Vindman offered the name of the first individual but did not disclose the name of the second, which Republicans during the impeachment hearing suspected was the whistleblower.
In an interview with The Atlantic Editor-In-Chief Jeffrey Goldberg, Vindman expressed criticism of Trump, calling him Vladimir Putin's "useful idiot."