GOP Sen. Johnson tries to undermine impeachment inquiry witness Alexander Vindman

Ron Johnson.
(Image credit: Chip Somodevilla/Getty Images)

On the eve of Lt. Col. Alexander Vindman's public testimony before House impeachment investigators, Sen. Ron Johnson (R-Wis.) sent a letter to House Republicans, questioning Vindman's credibility.

Vindman, the National Security Council's top Ukraine expert and a Purple Heart recipient, is set to testify on Tuesday. He listened to President Trump's July 25 phone call with Ukrainian President Volodymyr Zelensky, and immediately shared his concerns over Trump's request that Zelensky launch an investigation into a political rival, former Vice President Joe Biden, and his son, Hunter.

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Catherine Garcia, The Week US

Catherine Garcia has worked as a senior writer at The Week since 2014. Her writing and reporting have appeared in Entertainment Weekly, The New York Times, Wirecutter, NBC News and "The Book of Jezebel," among others. She's a graduate of the University of Redlands and the Columbia University Graduate School of Journalism.