The congressional hearings investigating whether U.S. President Donald Trump should be impeached have riveted onlookers’ attention on a group of government officials who have thus far provided abundant evidence of presidential misconduct. As is often the case with Trump, some of the most damning evidence comes from his own lips—read the transcript!—or from the mouth of his truth-challenged attorney Rudy Giuliani. The whole sordid business came to light when an intelligence professional assigned to the National Security Council blew the whistle on Trump’s efforts to extort personal political favors from Ukrainian President Volodymyr Zelensky. Since then, the whistleblower’s account has been confirmed by a widening circle of civil servants, foreign service officers, decorated military officers, and a couple of Trump’s own appointees.
Walt, Stephen. "Impeachment Is Redeeming the Blob." Foreign Policy, November 14, 2019.